Okay, thanks for replying!
I just don't really like how those tables work, so I've been hoping for a better solution. The consignment stores in the sims 3 for example were perfect. The selling tables just spawn 3 sims every couple of minutes who will buy something and then they leave again. If you're on a completely abandoned place you would sell just as much as when you're in a super crowded place, because the sims who are on the lot don't actually shop at you're table, only the specifically spawned ones. So there is no challenge or way to improve on your sales. At least that is how I observed they worked. It might not seem like a big deal, but I just don't enjoy it haha.
