Yes, you're thinking - why should we convince anyone to go opensource, its the better, cheaper alternative, and all savvy entrepreneurs would use it. But the landscape (here, anyway) is a little different.
Scenario: entrepreneurs are given grant money, to develop their product within a span of 12-months. Part of this package also includes Microsoft's BizSpark - 3 years free licenses for all needs, and you only pay on the 4th year (assuming you survive). They don't force BizSpark down anyone though - its just an option that is available. Its clearly easier to get Microsoft-trained developers - the market is gleaming with people that know .NET.
To the entrepreneur, go-to-market faster, can definitely be useful. Say, "use Rails, and you can have a prototype out in a few months", and it should make their eyes go wide open. But hiring good Rails talent can be more difficult (esp. with the tiny amount of grant money).
But the old adage that TCO is lower, or use it because its free, doesn't hold any longer. Entrepreneurs goal: go-to-market fast, survive, make money, profit!
So, how would you convince the entrepreneur to choose opensource, considering she's got all this weighing in on her?

