I assume that because this deal is $300+ cheaper than anything Adorama can offer, and that on a deal site, most people are looking for the best deal possible. Beach Camera has done dozens of these deals and I haven't heard any major complaints about getting the rebate back. As long as you follow the instructions, it should be no problem.
And yes, depending on what you want to keep and sell, the deal is really good
$2599-400 = $2199
sell printer for $100-150 = kit for $2050-2100, which is a few hundred cheaper than I've seen before (I think $2350-2400 was the previous low)
sell lens for $750-800 = body for $1300-1350, which is cheaper than Canon was selling the body refubished.
Great information for many who consider buying!