I think we've hit the nail on the head here ... like the blow-up pools, the import crowd have managed to make "temporary" spas.
Ideal for renters and more mobile folks, they set up in a jiffy on your patio, or even in your living room. That's probably why there's some sort of GFI on the plug ... I suppose we ought to give them credit for trying.
Designed for ease of both set-up and tear-down, I just can't see them being any more effectively controlled than, say, Barbie dolls.
