I really like Billy's playing. He's not note-perfect and he's not Mr. Technique but I don't see that as = no value. I've read his book and have his DVD and recommend them for different ways to look at drums and music in general than the average video. I think it's important to step back from the technique wars and see people who have let that go in favor of music. (I study technique plenty so maybe that's why I appreciate the different approach) I like Keith Carlock for the same reason.
To me though, no one is worth $100 an hour. Not Vinnie, not Virgil, nobody. There just aren't enough "secrets" to music or drumming to make it worth that kind of money. If you have basic hand technique that is solid, the rest is up to you. You'd be better off buying some CD's in a style of music you don't listen to or going to see an inspiring gig.
I think studying privately is very valuable if you can do it long term and on a regular basis; otherwise (again, to me) it's pretty much pointless.
