It's not about buying what I want... if I wanted to buy the battery I wanted I would go over to hobby king and get some lipo.
I want to keep the hobby cheap. I don't have a lot of extra cash with student loan debt and a new kid. Its also b/c I was a poor student when I built my first ebike, and would like to offer some folks the chance at seeing how using old laptop batteries works out. I know some ppl are going to say it'll just suck, but you're not in my situation and I've seen some evidence online to suggest there is some great potential in the old laptop cell route.