Promo/Discount codes that we can create in admin and give to customers that they can apply at checkout for a discount. OR, if that's not possible, the ability to make a video, photo set or store item a certain percentage off. Perhaps memberships, too. Customers looooove discounts!
Coupon codes for store items possibly memberships too
it would be nice to be able to offer a 5% off or whatever for store items sometimes. holidays, etc. The same could be said for memberships. Coupon codes are nice because they are a one time thing and dont require setting up new price points and you can limit who you want to make the offer to more discretely.