As far as Canada is concerned from what I have seen $80 a case is like winning the cheap paint lottery. Hence Pump gets loving with the players who can't raid someone elses' pocket book.
Plus as man have said it is about the challenge, you play pump or even that style and you get better since you have to pick and choose your shots and adapt your playstyle. When/if you do play semi on occasion with a full hopper (100+ rounds) you will be amazed at how well you do.
I have never had more than 100 rounds on the field with me for a normal game since I started playing and normally a 20 min game is just me and my winchester, whether pump or semi and I wouldn't have it any other way.