I personally don't like the gelat shop having so many weapons/items in it but the whole gelat thing is up to Stefan so it's a touchy subject. I agree that it probably isn't making much profit anyways, but that isn't exactly something I could change without getting my head chopped off.
I think Stefan was talking to us about possibly revamping the entire gun system so have to wait to see what his thoughts are on that to see how it would affect the gelat shop.