Instead of the current system where you set a maximum price for a photo and then the rest of the sizes below that get a price based on an algorithm, please consider re-thinking how you price photos.
For instance, if I upload a 36MP image and price it at $15, then it currently creates many smaller options with the smallest one being around $3 or so. Thats fine.
But if I upload some 4MP files in the same batch and batch everything at $15, then the 4MP photo largest size is $15 and the smallest will be about $10. Not very appealing for a buyer.
Please consider changing things to work as follows:
Photographers have say 5 or 6 price fields to set up in a template - XS, S, M, L, XL, XXL for instance. Each of these sizes correlates to a Pond5 set size. The artist prices EACH of these size fields as they wish. Then when you upload images, if they fall below say the XL size, then XL & XXL don't show up and the maximum size and price available is the L size. The other smaller sizes and prices stay consistent, as the photographer set them.
This is essentially how every other stock site works and it makes a LOT of sense
(sorry Pond5 - think I opened a support ticket on same issue by mistake)