Because I was curious and couldn't find it easily listed anywhere I went and calculated the range of credit costs and return per credit for sales at Dreamstime. This is for 2010 credits, older credits may be worth more or less. These are for non exclusive images.

maximum cost is 1.25/credit - max return 50% = .62 per credit

minimum cost is .77/credit, min return  30% = .23 per credit

for subs packages the return varies from .35 to 1.05 and the cheapest the buyers could get the images are about .20 per image. The most expensive for maxing out a subscription is around .43 per image. obviously DT is not expecting anyone to use all of their subs.

If I am wrong with my calculations, please correct me.

--=Tom