I've got one additional RAW format for one pic so far, but haven't sold it yet. Selling a RAW file seems to be an interesting income for a contributor, but is also expensive for a buyer.
If we would know how big the part of sold RAWs is for DT, we could reconsider this (a little time-consuming) option for all our uploaded files.
I would like to know this answer too! does having a raw format help sell an image? who is getting a better sale out of it? I have uploaded at least a dozen raw files, but never sold one yet. inquiring minds want to know!