They usually simply refuse to read the impedance checkmark on the box. However, even when they get that right, there is frequently a 32 ohm-er inside a 600 ohm marked box. I suspect they refuse to address this because more people than not don't realize or care what they're getting.
I hear you. Received a new pair today in the mail from Warehouse Deals, fortunately they got it right this time. Listening through my AE D1 I feel like they are a bit underpowered. I can crank the knob all the way up without them really reaching "loud" listening levels (at least for my tastes). I certainly don't think they sound a lot better than the 32 OHM version when hooked up to the D1. I have a Schiit Valhalla on the way, however, so maybe the true "revelation" will have to wait a few more days.