If you own a UMD streaming site, you can give active members a discount to buy scenes to keep. We do it by giving them exclusive coupons: Simply edit any subscription package and attach a coupon to it, and all members will be able to use it while they're joined, but only for scenes in that subscription. You still get to use all coupon features like expiration dates, min purchase amount, max uses, etc. The coupon itself should be set to "personal" when you create it.
If you are a producer who uploads content in advance and post-dates it for the future, you can now allow streaming members early streaming access to it, up to a date limit you set. This could be used as a perk in that they can stream content that can't even be bought yet. Again, edit any of your streaming packages to see the option.