This is the exact reason you try on MANY boots at a store and wear them for at least 15 minutes. This is not burtons fault, there are tons of people the boots will fit correctly. If there is pain its the wrong boot for you, not the companies fault for making something that doesnt fit a specific persons feet. If there was any pain or discomfort to begin with either you shouldn't have bought them (since even with lacing them differently, or intentionally looser which you should never do, it didn't help)
If boots are not comfortable in the shop why would they be comfortable for hours on the slopes? Any pressure point is a bad thing, just like people don't buy sneakers that hurt or cause discomfort.
Burton lost respect? Yeah email them and ask them to apologize for not making a boot that fits your specific feet perfectly.