Hi.  I'm looking for an alternative investment and think microstock might be an option.  Specifically, I'm thinking about buying the copyrights to microstock that have existing cash flow.  Before I spend a great deal of time on this, I thought I might solicit some feedback. 

Assuming you would even sell your copyrights, how much would you sell them for?  1 year of existing cash flow, 5 years, 10 years?
Is anyone already doing this?  I did find a company paying $50 per image, but that is for images not already producing revenue.
Is it easy to verify how much an image is generating? 
Are you aware of any technical reasons the microstock agencies wouldn't allow the transfer of an image to another account.  I assume I would just resubmit it.  Note: I do not have an account with any stock agencies yet.
Would moving an image from one account to another completely wipe out cash flow?
Anything else I may be missing?

Thanks for your feedback, please keep the "I would never sell my copyright" comments off the thread, as I already know many would not sell their babies.

Thanks!