My Jonsered guy is an Echo dealer also. He gets homeowner saws bought from Home Depot in for repairs. He's had to turn down several warraunty claims for you guessed it. Bad gas scoring. He gets bad mouthed of course, but you can't fix cheap and stupid.
I think the person that buys a saw from a box store to save $20 is the same person who thinks the guy selling the saw is just out to get them to spend more money on fresh gas and oil when they tell them not to use old gas, or to buy EXPENSIVE canned gas.