Want to hire essentially is the same as WTB (want to buy). When you hire someone you are technically buying their services.
I had thought of doing WTH, but then what do you do when you are selling services? WTW (want to whore)? And as buffalo mentioned, it's really the same as WTB.
Then there would be lots of threads like: [WTF] Are you listening to right now? [WTF] Is your favorite browser? [WTF] Does you real name mean? etc
WTO - want to offer.. but I agree it's all kinda excessive. P.S.: There is also WTD - What The Deuce, for all the family guy fans