I think a better estimate of cost would be to take the number of developers, multiple by an average salary, add the costs of marketing folks and management, add

I think a better estimate of cost would be to take the number of developers, multiple by an average salary, add the costs of marketing folks and management, add the costs of offices and then multiple by 3 (profit margin). That would give the base a amount that companies building the replacement software for OSS would need to earn. I doubt very much that would be a figure around 177million. Also what happens now is that companies take OSS, modify it in house and then either give back those changes or use them as a competitive edge. Would this be possible if the software is sold with a restrictive proprietary license?