With the new 'instant' hot water heaters they sell now it might be a little less impractical.
We have a hot tub at the house. Why anyone would have a jacuzzi-type bath tub is beyond me. The amount of water you need to fill it will run your bill up by quite a bit. That and needing a large hot water heater along with the energy to heat it. If you plan on using one more than once a month it's a stupid addition to a bathroom. That and if you're not using it regularly it's a maintenance nightmare. All in all it's better to just buy a real hot tub.
And, PLEASE, no more pix of redneck tarp tubs. Eeeeeew....