I think my imagination dictates the technologies I use. But at the same time, my imagination can be technologic. Sometimes I see a tool and I know immediately how to use it, but most of the time I use the tool for an idea I already have.
I think a lot of times it's not money that's the primary motivation factor; it's the passion for your job and the professional and personal satisfaction that you get out of doing what you do that motivates you.