Don't be lulled into thinking it's a price issue either. It can and does happen on low grade guns all the way up to and including Purdeys. I was at a shooting school where a fellow had a brand new Purdey whose right barrel shot 8 inches high and 5 inches to the right. He didn't seem all that concerned although the inctructors were adamant it should be corrected. His wife, who paid for the gun was less than pleased to put it mildly.
For me if you shoot a gun great don't ever shoot it for POI. If it's not right you'll never hit well with it again. Either do it as soon as you get it or stick your head fimrly in the sand and leave it there.