Because the big box store have some policy standard. You know what you are getting into. You have 30 days return if anything go wrong. They have a reputation to hold up and have across the board policies. AND you know after 30 days, you are on your own. Dealers are like crab shoot, you can find a very good one, or you can get some really bad one that is dishonest and try to just cheat your money. Service?!! They almost always charge you an arm or a leg. I had bad experience of dealer cheating. Warranty?!! It is all up to the dealer how they justify, how they report to the manufacturer. They can make it sound like it's all your fault. There are enough complains here to back me up on this. Bottom line is there is no standard of dealers, if you are lucky, you get a good one. But do you feel lucky?? Where is it written that dealer only service what they sell? It is because a lot of you guys are so loyal to them and they get spoil. It is almost like there is conspiracy between the manufacturer and the dealers. When time is good, no big deal. But in this economy, wise up!!! Why people keep thinking HD sell second rated Echo while ALL people have good experience with the "cheap" Echo??!!!