There are many aspects of WoW that attract people: PVP, Questing, Community, Leveling, Gearing up, etc. For me, I’ve often looked at playing the auction house as my own form of PVP - Economic PVP. I get a great deal of enjoyment from it, which is both profitable AND fun. Compromising, nay, obliterating this aspect of my enjoyment of the game will alienate it. I’ll have to cancel both my accounts since this “fix” eliminates virtually half the enjoyment I get from the game.
When WoW increased the capacity of and sped up the Mailbox delivery and changed the AH format to make undercutting much less necessary, I felt that was a measured and reasonable change- Bravo! But this last change seems unnecessarily punitive. Sure, do a bot purge, or go after some of the multi-box players (in spite of them supporting all those multi accounts), but whether you use an AH add-on or not, you still have to invest time and effort on the AH to get value from it. You only get out of it what you are willing to put into it - why punish those who are willing to contribute the effort to maximize their enjoyment and value from the game?
Please reconsider the AH “fix”.