as of a while ago you can only upload 25, if you have the legacy version, which you seem too, you can only sell 25 but have more. but you can no longer rotate them. if you pay you can sell all of them. customers don't ask if something is for sale when it's not for sale.
every image shouldn't be for sale. but if it is, don't touch it.
---Mike Savad
MikeSavad.com