The fact that someone can pay for skills that other people spend a long time to get seems kind of ridiculous. It completely destroys the value of MCMMO skills and ruins the general balance of combat and other things on the server.
If everyone grinded for their own skills and got them legitimately we wouldn't see the whole "NOOB DONATER" thing, there would be no way to dispute someones skill because they would've gotten the skills legitimately.
Basically; Donating for skills = New members quitting immediately because MCMMO balance is waaaay out of wack. I have no issue with Laser making donating more interesting, he definitely deserves the money for hosting such a great server, but donating for skills? IMO bad idea.