Ironic, isn't it?
Ideas for me always seem to take the backseat whenever the client sites are involved.
Sure, I've started projects, get them 1/2 or more completed, only to shuffle them off onto another disk to wait until I don't know when. It's not for any great lack of motivation or money however. The business we're in seems to prevent any sort of real time to blow the dust off and continue. Still, I'll hang on to them in the event that I take a longer than normal vacation.
In the past 10 years, I've only fully completed two out of roughly 5 and put them on. They do fine as far as holding their own on the monitary end.
I find that putting a project together is much more fun than having to maintain the project once it's completed.