Well if gold is the cost to respec, then they could have it percentage based.
So:
- Respecing at level 5-10 would cost 5% of the player total gold
- Respecing at level 11-15 would cost 10% of the player total gold
- Respecing at level 16-20 would cost 15% of the player total gold
- Respecing at level 21-25 would cost 20% of the player total gold
- Respecing at level 26-30 would cost 25% of the player total gold
- Respecing at level 31-35 would cost 30% of the player total gold
- Respecing at level 36-40 would cost 35% of the player total gold
Now respecing multiple times in a short time frame would add a 50% bonus to the cost each time. This bonus would reset once every week.
This is of course assuming that gold is account bound, shared across the account, and also doesn’t rain from the sky.
On the other hand if respecing costs a farmable material or item, then maybe something like:
Either way, respec imo should be something that a person wouldn’t want to do constantly, at least not without paying a price that is.