#1 and #2 require substantial legal expense and a lot of subsequent sales and support management effort. And unless a founder has a prior experience building this kind of organizational infrastructure, it will be a very painful experience to go through. All in all, it's a project that is simply too risky for the investors to put their money into.
1) Dual licensing 2) Charge for commercial support 3) Sell hosted versions (might not apply to you) 4) Advertising?