It's been pointed out before that I happen to use the very laziest of profession and auction alts: a level 65 death knight. Death knights start at 55 and can be facerolled to 65 with the least investment of time of any class. In my reply to that comment on the original post, you'll see my method: I never level anything except the character I plan on playing in the endgame. I'm a busy man, and among all the activities that can be done in World of Warcraft, I prioritize leveling just under patching my client and just above reputation grinding.
Well, it's a good thing that my poor, facerolling DK has been grinding the dungeons for the last week, because one of the trade skills I've maxed on him is undergoing a pretty serious change: All enchanting recipes that require a skill of over 510 are apparently not available from the normal trainers in major cities. That's not the end of it, either -- blacksmithing, leatherworking, and jewelcrafting are all capped out at 500 skill at the city trainers. Special thanks to my Hunting Party Podcast co-host Darkbrew for confirming these values for me in the beta, and thanks to Kaliope for writing a post that pointed me in the right direction.