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Why would you need investors to distribute a licensed product? I've used a number of programs at work that seem like they're developed by a very small shop or possibly a single person. They perform a small but important function that companies are often willing to pay a reasonable price to figure out.

To be specific, it's importing tables from Excel to AutoCAD and Revit. It seems like this is something that AutoCAD and Revit should be able to do, but they handle it very poorly.

http://www.cadig.com/products/

http://dotsoft.com/xl2cad.htm

Licenses are ~$30-50 each and every company I've worked at has happily paid it rather than let employees waste time fiddling with the terrible native functionality.

I don't know how much the creators are actually making, but it seems to be enough to keep them going for the past 10 years or so.