Still can't comprehend Selenites

Being able to purchase a border frame is all fine.. but I think my free border suits the pfp, and I'm content. Is there any use of selenites except being able to buy borders?

Also, I've got, like 188 selenites (imagine if global chat could give you some selenites), and when I open the shop, it reads "No items found. Nothing is on sale right now".

Is it mocking me because I don't have enough Selenites? Can I not even see what i can purchase if I had more selenites!!??