500px and Prime need better watermarking, a lot better. That`s my reason to hold most of my images to their platform.
It would be great, at least to have an option where to place the watermark on the images - in the center, on the top or in the bottom... for example. Why don`t you test something like that.

Thank you Ronnin. I will delete my videos from fotolia anyway. Couple of years ago they were selling my full resolution images for 0.35 and now my videos for 1.35. I`ve had enough.
@Mat - thank you for your advice but I will delete all from fotolia.

May be they will raise the prices... 

Couple of days ago I got 1.70$ for small web DL. The script I use showed me 0.10 $ per credit (small web - 17CR - 32$ - regular price). So I`m not surprised.

I'm thinking about dropping exclusivity at IStock. More files - videos/photos and no views, no DLs, no normal communication with representatives, locking threads without reason...