Request the ability to mark an item as owned.  During the Holidays Every Plant put together several items as a bundle and sold that.  This bundle contains several plants that are also sold as individual items.  The issue becomes that when I see something I don't know if I already purchased that item in a bundle or not.  Or another aspect is that I bought a lot of Tempest3D characters for Pauline when they were sold at Content Paradise, however not the entire collection so when I look at the store I have to try and remember if I have that product already which means I might buy it since I don't need two copies.  This would have to be a separate flag on the product, so someone does not go in and say they own the item and then download it for free.  Currently there are three colors Green meaning you can buy it, Red means it is in the cart and Blue with a check meaning you own it.  Maybe make a fourth that is Yellow with a question mark to alert the shopper that they have flagged that item and caution them about adding it the cart since they are the ones who flagged it.

Poser 5, 6, 7, 8, Poser Pro 9 (2012), 10 (2014), 11, 12, 13, 14