ROFL. My suggestion for a transitional license to ease proprietary companies into a GPLed world is dreamt up yet again:
[link|http://www.itmanagersjournal.com/articles/05/12/14/2217243.shtml|http://www.itmanager.../14/2217243.shtml]

Of course, the authors say "For the developer community, this offers a mechanism to make a living" and "This gives developers that are profit-motivated an incentive to work". ROFL. Have they never heard of support? Hell, my boss already calls the main product we work with 'a trojan to get consultants into the building'. The vendor could easily give away the product and still make hefty profits; hell, fixes and improvements for one company are often rolled out to all clients - an OSS business model is only a short step away for these guys. And they don't work too differently from other software houses I've worked for over the years.

Artificial scarcity is NOT a principle that it's safe to hang your business off of (though it would seem to be the only principle that economists, politicians, pundits, and established businesses recognize); the scarce resource in IT and software development isn't the 'bits and bytes' after all; it's the people that wrangle those bits and bytes into useful form...