Leaping in late, but as I note this is now a numbers game, here's a quotation from the BJP in an interview with the Image Bank as was: we have 36,000 images of the Eiffel Tower.
I think that was in the years B.D. (Before Digital). Imagine feeding in image no. 36,001 and hoping to rent it out for money.
Then imagine feeding it in today, as no. 36,000,000 to whomsoever took it over, Big G or C. And still expecting to be paid in money. But wait: didn't the tower people decide to make it a copyrighted property some years ago? Maybe you'd end up paying them for your efforts.
Rob C