The common gripe about all those things, including character transfers and whatnot is actually the fact that there already is 15$ / month subscription to the game and an expac every 1.5-2 years for full game price to fund the Blizzard's Money Swimming Pool.
Yes, yes, those things take development resource i know, i know, but then maybe really Blizz should focus on making the content then. Cataclysm already managed to annoy many of fans with delays on Firelands, lack of Path of the Titans and lowering the difficulty, slapping another paid mount is really not the best thing Blizz could do at the moment... but eh, they have the benefit of large player base that includes enough people that will buy it to save them time on getting the normal mount.