I'm sure you'd have a lot of fun doing it, and it'd be a good learning experience. As well as doing some money on the side.
However, not to piss on our parade or anything but.. It will be a lot of work and when it come down to it and you look at your hours spent doing this and your profit, well, it might come shy of minimum wage. Being your own boss is a hoot however which is not to be taken lightly.
You've nailed a 200$ profit in a day. It was a good deal (and congrats) -- But can you reproduce it or was it a lucky shot?