If you'd like to start a company along those lines, be my guest. Purple et al. are the ones who come up with and advertise their trials; you don't really have a

If you'd like to start a company along those lines, be my guest. Purple et al. are the ones who come up with and advertise their trials; you don't really have any basis to blame customers for using it as it was presented to them. Perhaps these are a sort of the perverse capitalist incentives the hippies keep warning you about. ;)