Well for one I don't plan on being rich, my goal is around 100,000 a year doing something I love to do (I.E. Working for myself online), for now though what keeps me going is the thought of not going back to a regular job, really when I think about it all I need to survive off of right now is around 2,000 a month, not a whole lot when it comes down to it.
Overall motivation though is a house, not going back to a regular shit $12 dollar an hour job when all you get at the end of the day is stress, the satisfaction of succeeding on your own and knowing if you do fail it was under your terms, it was not because of someone else or company downsizing, or any other bullshit that comes from working for someone else.