There's a difference!!

OK, I know it's been asked before, but I REALLY want to know...what is the difference between spaghetti & pizza sauce?

Yes, they're both tomato based sauces, with similar seasonings. I know one is thicker. Food snobs usual answers on forums are condescending & useless as far as getting the answer.

So seriously...what's the difference between the sauce for

THIS:

  And THIS:

Cause if I hear one more person say it's the same...tell me, when you're eating THIS:

And you try it at home with canned spaghetti sauce...it's gross, isn't it? It's more than just being thinner. There's a seasoning difference. No debate on the difference between uncooked & pre-cooked sauces needed, I get it. I just want to know why I can buy a can of spaghetti sauce for $1 & have to pay the same amount, if not more, for a jar HALF THE SIZE, of pizza sauce...if it's the same?