Many times I can crop a photo for more impact; not only making the image better, but also making it read more clearly as prospective buyers browse through hundreds of thumbnails. So, I know (or think I know) that it will have a better chance of selling.
But on the other hand, I will be removing options for cropping that might be important to the designer in fitting it into their space or having room for text - or even having the flexibility to change it's orientation. That might reduce its saleability.
I normally shoot a variety (far and cropped) in any given situation; but sometimes I have a single shot or one with expressions that are really great on one image.

So, I'm looking for your collective wisdom based on experience. Or heck...just gut feelings.

Thanks Gostwyck! I did consider submitting two versions (cropped and uncropped), but was apprehensive that one (or both) would be rejected by the reviewer. I'll try that next time. (I only submit to SS, FT, DP, and BS, so I guess the real answer will be when I see how each responds.)

Thanks - I do that whenever possible. I'm just thinking of occasional shots that are one of a kind. Really appreciate your input.