99% of the time when it's 'free' or dirt cheap you're simply hauling away someone else's trash in my experience
Yep, I watch the market like a hawk (just curious to see how tubs age over time, what condition they're in, etc.). 99% of the time the tubs are sitting dry for who knows how long, and there is usually something "easy to fix" wrong with the tub (small leak, broken pump, whatever). Half the time they want hundreds of dollars for them.
VERY rarely (I'd say about 5% of the time) do I ever see a nice hottub filled with water in the pictures fully working and ready for use. I never see anyone giving away a working hottub lol.