You can find them in stores here, but they're not popular. I've told several people about them, and they were just as delightfully surprised as I was.
Go somewhere with 240V and two things happen: (a) you're far more likely to die of electrocution in your own house and (b) you can get a decent tea kettle.
At 110v you would be looking at 27 Amps which may be a little high. I had not thought this one through before, thanks.
The maximum current determines how thick the wires have to be. Since power (ability to heat or do other work in one unit of time) == current * voltage, doubling the voltage doubles the amount of power a wire of a given thickness can deliver.
Looks like the maximum power that a US kettle can produce is 110 * 20 = 2200 watts, so will take about 3000 * 2200 = 1.36 or 36% longer than an EU kettle to boil.
Microwaves make more sense in that scenario
They're also frequently mounted overhead, where it's more dangerous to retrieve a mug or big Pyrex cup. Contrast that with the kettle which has that little flap over the spout and is spill resistant.