That really depends on the idea. Many ideas can't really run and "break even" with a small version. Those that immediately tie into a payment system, maybe, but

That really depends on the idea. Many ideas can't really run and "break even" with a small version. Those that immediately tie into a payment system, maybe, but many, espeically the biggest ideas (say, Groupon, Twitter, Square) I don't think would ever be able to break even or maintain a small profit if launched subscale.