The only one I've gone on is a Skycoaster (Ripcord at CP), and while it's a great thrill and a terrifying experience, I don't care for paying the extra charges either. When I did go on Ripcord, I was an employee and had all the regular CP stuff for free daily anyway, so it didn't seem like a big deal. Personally, I'd rather get my money's worth from the park itself, even though they are great rides, and definately an interesting experience!
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Po!nt of View: A different look at Roller Coasters.
http://www.crosswinds.net/~justmayntz/thrills/index.html