That's interesting: for the iHearHD, you go from 1000$ to 1500$ if you want a 2-year warranty. I always got at least a 4-year warranty for my regular hearing aids. Even assuming a linear cost, a iHearHD with a 4-year warranty would be around the same price as regular hearing aids.
This also includes 1 additional year of batteries (something worth 50-100$). But this may also be a signal they are not confident they are reliable enough?