Originally Posted by MarkMan

OK, from my old experience usually clicks to sponsors are about 10% .. so if conversion is 1:9800 that means their were at lest 98000 users viewing that gallery per sale.

at 770k per user (based on 4 fully loaded pictures average, and average thumbnails size)
that's approx 75gig *Cheap hosting $1/gig =$75

since a sell is at most $50, how is this affordable?

and even if its hosted galleries by the sponsor.. how is this affordable for the sponsors?

P.S
---
Thanks for sharing this info