In 2005 I paid 35,000 for a brand new X2 (same boat with more modern features).
What makes you think they're asking too much? hahaha!
It crazy how strong the market is for older V-drives in good shape. We have companies like Nautique, MC, and Malibu to thank for that. It is definitely a sellers market.
With that said, yes, that is too much. Look at this:
http://www.wakeworld.com/forum/showthread.php?t=804800
That guy is about to get a bigger boat, 5 years newer, for just a couple thousand more.