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Probably depends on what you're sending... subject matter could be a big factor.  I haven't seen a rejection in a while.  Maybe one every few months out of 100 or 120 images.

They dont like my people on white - must try harder!!!

People isolated on white are easy to get accepted, true, but I don't find they sell all that well anymore, because the market is so oversaturated with them. 

I know! ... But if you want higher acceptance, that's what you do.... Or office scenes, endless business people in meeting rooms...
That stuff is easy to get accepted, but then it won't sell anywhere as much as some really good travel or nature shot (if you ever manage to get that through).
My advice above was on how to get less rejections, not how to make more sales...

Currently I have no problem getting my nature, wildlife and travel images accepted. I think they are very lenient at the moment. At some point last year I also experienced I period of abnormal high rejections. On the other hand I don't know why I still submit to FT because very few new images sell. It is very frustrating to see 'n small group of old (I mean like four years old images) that keeps selling every day, while I know I have since uploaded much better images of the same subject.