Three guys, on three different occasions, said they wanted to go linux or nothing. Note that all of these conversations had nothing to do with the question of whether the business was viable or whether it could turn a profit. On a couple of occasions, we had some really good chemistry and the plan was looking hot. But they were convinced that ANY business idea that ran on .NET was a bad one.
I've never had somebody say it had to be .NET or nothing. I'm not sure what that means, but there it is. It doesn't make much sense to me from a business standpoint.