I thought about adding how many other parties are shopping in your place as a factor, however I realized it works both ways: Yeah, they don't want overcrowded places, but at the same time, if other people come there, it must be good, yes?
Remember we go by days. The assumption is that they are not sitting in your shop the entire day, so the overcrowding is fairly limited.
If no parties visit your shop, maybe you should check if you make enough advertisement? Spend money on a shop sign and such, maybe?
I have all three advertisements...
