I don't know what to say

[Tharn]

Who in their right mind would fork over money to get their characters power-leveled in an RPG?
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The very same people who are willing to pay for items.

I can understand using powerleveling service to max level in cases where you already know the game well and you want to make a new char, for example on another realm. But paying to powerlevel a new class would just make me lvl 60 n00b.

This practice was actually very common in PvP circles in Diablo2, however that was for in-game items. However WoW removes this need as you can respec, unlike in D2 where for each item setup you needed pretty much new PvP char (if you are perfectionist). There was also no danger of loosing whole account (either via malice or bad security on powerleveler's side).

Edit: I do not defend it (I actually think it's pretty stupid to do it, but I consider gold farming worse), I just try to explain some possible motives