business – Do any stock photography sites pay 100% of sales out to photographers?

I’ve come over from Stack Overflow to see if anyone here uses stock photography/microstock sites and knows if any of the many out there currently give 100% of sales to photographers?

Obviously they’ve got to make money somehow and I know some do monthly subscriptions to photographers to host their images but I can’t find any that charge a small upload fee to add images and pay out 100%.

I work for a design agency in Brighton and we recently sourced 7 images for a client for £4K and the photographer only sees something like 20% of this and it seemed a bit unfair.

EDIT: Amending the question, if it were a well used site would you USE a site where you paid a small fee for each photo you upload (either annually or a one off) and kept 100% of the proceeds?