It seems to me that when a patent covers a product that is sold, the sale implies a license on that patent for that product. The license is sold along with the product. So if the über-toaster is resold, the patent license is sold along with it, regardless of the number of intermediate steps.

If that's not how the law works, it's how it should work. Actually scratch that, the way it should work is to not have patents at all, since they lost their net benefit to society a long time ago (if they ever had it), but that's a whole other can of worms.