Potbelly’s Meatballs

Just a quick question regarding meatball subs/sandwichs, is there a legitimate reason why most places put huge pieces of tomato skin in the sauce? Even pizza places put huge chunks for tomato in the sauce, why? I guess some people like it on pizza (not me) but I just feel that if I wanted tomatoes on my meatball sub I would have asked for them. I find it extremely gross to be eating a delicious meatball sandwich and bite into a large piece of tomato skin. And it’s not just Potbelly’s that does this, Quiznos is guilty of this as well…. Places like Subway don’t do it, so why do these other places have to?