From what I’m reading, OP isn’t looking for a freebie. What it seems he wants to do is have Player X buy a WoW token with retail gold then ‘gift’ the token to him in exchange for Classic gold.
So he needs to know if this is allowed and then determine the conversion rate.
I need one as well! 
Yeah, when they first launched, we saw a lot of questions about it in the CS forums. You weren’t the only one to hope to profit on them like that Brewbeard 
A violation, no. Just unsupported. Blizz doesn’t get involved at all with unsupported transactions. What they might do is look into if a scam took place, but even if that did happen, Blizz still will not return gold. That’s just their policy.
Again, I really can’t stress how easily this could go south for the OP. I just don’t want to see them lose out on the gold from classic and still not get game time.
Yes, of course it can be any amount that the players agree to. However, those players are going to, by and large, go by market conversion rates and that’s about what it is currently.
Yes, however someone has noted that you cannot gift a token, so we can simply change the token to be an equal amount of gold that the OP could them buy a token from the AH on retail.
So, here’s how the transaction would look:
OP on Classic gives a specified amount of gold to another player on Classic.
The other player on Classic gives a specified amount of gold on Retail to the OP’s character on Retail.
OP buys a token on Retail with that gold on the Retail AH, and can play classic for another month.
This is definitely a valid point. It would be quite easy for someone to take the OP’s gold, and offer nothing in return. Especially since you are unable to login to Retail and Classic accounts at the same time (though being able to do so would only make things faster).
About 50g in Classic would be comparable to a amount in Retail that would give you the purchasing power of one WoW Token.
That’s going to depend on server. Some of them are about .50 per 1g and some are as low as .3 per 1g so the range looks to be about $50-100 dollars if you can find someone willing to do it.
My $1,000 estimate was based off launch pricing when I first ran this thought experiment.
Well, it really depends on how you’re doing the conversion, and who you would be trading with. I would assume a friend or close guild member.
I would do the conversion such that it was approximately $20 worth of gold, not $1000 worth of gold, as that doesn’t make any sense to me.
Ravinar, if you do decide to go ahead with this and take the chance, be sure that ALL negotiations are done through in-game chat. That’s the only way Blizz would be able to look into a scam if it came down to that.
Do not trust anyone not willing to discuss it through in-game chat.
As for the conversion, if I was going to do this for someone else, it would be at a large premium But that’s me!
I understand what you’re asking. I’m giving you the conversion rates without going into too much detail because I’m not sure how close this kind of discussion skates to the edge.
You’re looking at trading about somewhere between 100-150 gold and that’s if someone is desperate for retail gold.
You can arrange this through the in-game chat but that will only enable Blizzard to remove whatever you traded to the scammer. They won’t return the scammed gold/items to you.
Also, it’s probably faster to roll a character on retail and farm 175K gold than it is to farm 150 golf in Classic 
I wasn’t talking about $1,000 dollars worth of gold. That was about how much gold it took to buy a token on launch.
Do you think this link will help you:
If the retail character is tied to your account; then, the account gets the subscription time. Thus, your “classic” character gets game time.
Yeah, I have no idea. I did do a search for WoW Classic gold to determine that 50g in Classic would have a value of roughly USD $20.00 which is approximately the value of a WoW token.
I have no idea what someone interested in trading Retail WoW gold for Classic WoW Gold thinks that is worth. The last time I bought a WoW Token from the AH, I think it was 110,000 gold. So if that’s still the price, then that would mean that you’d have to find someone willing to give you 110,000 gold on Retail for 50g on Classic, for my numbers to make sense (whether the do or not, I don’t know)
Retail token is up to 175K and I believe you should peg the cost at closer to $30 for a couple reasons that I’m not going to go into but you could probably follow the discussion with what I’ve laid out 
Likely looking at about 120-150 gold; that said, I wouldn’t trade 150gC for 175KgR.
Off topic comment:
Those are interesting numbers. I think any type of trading in those figures will probably cause a flag.
Gold to gold seems to be within the rules. It’s a problem when real money exchanges hands.
Indeed.
Indeed.
Seriously, is 50g in Classic equal to $20 or 170kg in retail?
Did you ask him why he wasn’t a millionaire?
I explained above where I came up with my numbers.
I’ve also done searches for world currencies prior to flying, and have not always found money exchanges or banks that offer those exact rates.
In the case of trading Classic gold for Retail gold, it may also be walking a fine line. One that likely isn’t supported should something go wrong.
For what it’s worth, I am not claiming any special knowledge or insight into these numbers, and I don’t think I would personally risk making this type of trade.
Go to Walmart, buy a prepaid, reloadable credit card with the logo from Visa, MasterCard, or American Express. Put money on that card. Go home, use it to pay Blizzard. If you buy the Walmart branded one, it will be free to load money on it.
Make sure it is reloadable. You can’t use gift cards that aren’t.