Wicked is AWESOME! I saw it a few years ago when it was on tour. And as far as the ticket price, it's really no different if you were to go see it in NYC. But it's a really good show.
Ehh. I don't know. The whole dumbing down the book into a happy ending and making Galinda more superficial and.. ehh. I don't know. I liked the book and the character depth it added. Also they cut out Fiyero's whole family! And Liir!
Saw it, yes it is very very good. The special effects are phenominal. The singing is very good, and as I saw it with a whole performing arts/theatre tech class, we were all subject to listen to the soundtrack for months afterwards. Really an amazing display of set design!
The book sounds interesting but I have never read it. My teacher gave a lecture on it once though.
Whether it's too much really depends on how much you're making, so I have no idea if it's worth it.
I actually hadn't wanted to see the show since I'd hated the book, but I'm glad I went. I try not to think of how much a movie or play follows a book, anyways. I'd rather take each on its own merit.