Looks like they're only operating in the virginia/dc/maryland area and theres a magical "up to 1%" without any footnote going with the "*" to figure out what the "up to" fine print means.
BTW, costco and other group programs offer rebate buying and selling programs.
What you end up getting through these is often either an inexperienced buyers/sellers agent willing to give up a bunch of their cash, or a "mill" agent that wont spend much time with you. Not that this is necessarily automatically a bad thing but...it can be.
Be fearful when others are greedy, and greedy when others are fearful. Just another form of "buy low, sell high" for those who have trouble with things. This rule is not universal. Do not buy a 1973 Pinto because everyone else is afraid of it.