Shareware and Unix?

McDoobie asks: "Is there a market for low cost shareware in the Linux/BSD and Unix market in general? Would it be worthwhile to have a small home based business next to ones regular day job producing well made, but small, shareware for an environment that is dominated either by large corporations or Open Source developers? If so, what should a potential developer/publisher focus on to make their products/price range attractive to customers? What type of customers are most likely to look into such software? SOHO? Small Enterprise? Home users? In a nutshell, where should one begin when investigating the potential of the Un*x (and perhaps Apple) environment for the small time developer who's interested in earning a few dollars on the side?"