And what about IP ownership and trade secrets? Does that fly out the window because you want the source code?
IP ownership can be maintained by using an appropriate license, as can non-disclosure on trade secrets. If I were managing an IT department, I would not want to make a major investment in any software where I couldn't view or modify the source code; whether that's one of the "free" licenses, or a deal with a proprietary vendor is irrelevant. As the purchaser, that's my choice, and I have every right to make it -- vendors of proprietary systems that don't cooperate simply won't sell any units to me.