How do folks here process their green screen video footage for stock clips?

I recently shot some green screen clips on a pretty clean, even green screen. Now editing in FCP X to create stock clips, and can't decide if I should leave the shots "as is" or if I should key them to remove subtle variations in the background on full body shots, and then add a new green background. Either way, the buyer will have to key the footage. If I do a key while processing and add back a green background, it makes for a uniform background that I think adds a subtle appeal for buyers. The downside though is that I'm simply using the "Keyer" effect in FCP X and I don't know if this will make it harder for buyers when they key it a second time themselves. Maybe it's best I leave the footage "as is" and let buyers key it for the very first time when they purchase?

I'm not great at keying footage myself, so not sure of what process will ultimately be best for buyers. Appreciate hearing from people with experience in this!

Thanks for the reply. I had the same thought. But when I key it in FCP X and test it by placing it over a plain black background, I'm clearly seeing outlines on the person - not green outlines but more whiteish (if I use a white background instead of black, everything looks perfect). Maybe I'm just not good enough at keying to do this method? Or is FCP X a crap program for keying? 

I appreciate the kind offer, SpaceStockFootage, thank you! I do have After Effects 6, so I could key using that. I've uploaded a snippet to Dropbox and will PM you the link.

A public thanks to SpaceStockFootage! His AE settings were just the ticket, came out much cleaner than FCP X. Very much appreciate the help!