I guess it might depend on your project. I'm working on a 50+ minute project with very specific interaction between multiple characters--I don't think any mocap facility is going to give me that much mocap for under $2k (actually, if you know of one, let me know!) So, for me, a $2k system might be cost-effective. 

I have used bits of canned moves here and there, but overall they're generally not quite what I need, and I always have to edit the moves. It seems like having a real mocap solution that gave me the moves I wanted from the start would save me a lot of time as well.

--T