It largely depends on your goals and also the work required to develop & run this startup. You wouldn't have to get too many of those businesses signed up to e

It largely depends on your goals and also the work required to develop & run this startup. You wouldn't have to get too many of those businesses signed up to earn a full time salary. Take a look at http://www.softwarebyrob.com http://www.softwarebyrob.com, which is all about micropreneurial software businesses (basically targeting very small niches) - his book Start Small, Stay Small is interesting reading. Patrick McKenzie's (or patio11 on this site) Bingo Card Creator would be another good example (http://www.kalzumeus.com/ http://www.kalzumeus.com/).