I sold a bit on Stamporama a few years ago. The auction section wasn't impressive sales wise and seemed like listing there would be a waste of time for me, but I used the "approval" service to sell some cheaper material not worth listing on
ebay, mostly just for fun.
When they lost sponsorship (I believe it was Buck A Cover that had kept them alive) they polled their members to see if enough of them would pay a modest fee so they could fund their own platform. And enough of their membership did.
I stayed on as a seller by paying them $18 back in May, though I have sold nothing there since, nor for two or three years before. Unlike
ebay and others, they charge no fees on sales, nor do they beg for donations. As I recall, even this site went to demanding donations in order to sell, here.
I believe many buyers find it worth $12 annually to search through a multitude of inexpensive approvals to build their collections.
Have you ever considered what it costs to sell through the APS, the sales and listing fees in addition to the membership fee and supplies, both the approval booklets and the stamp store pages. And if you're not a member, the higher sales prices charged on stamp store material, and that you must be a member to be able to purchase through their approval service?
On Stamporama, listing in the approvals section is relatively simple compared to what it takes to list an item on
ebay or put together an APS sales book. And there are no "middlemen" at StampoRama, all payment come directly to you, in full.
I think Stamporama is an excellent little platform for those whom it serves, people enjoying their hobby at the level they choose; at a level unavailable to them through APS or even
ebay; those at one time served by the many small dealers (and even large ones such as H.E. Harris) that sent them stamps on approval through the mail.
Just checked, and there are currently 574 approval "books" (most list their material on plastic pocket stock pages rather the print out paper pages from the templates supplied) in 21 categories. If you are a beginner or even a somewhat advanced collector, Stamporama might be worth a look.