Yes, this is essentially the same reason why you don't see robots flipping burgers. The automated equipment would have to get very cheap to be cost effective.
AKA - if people are willing to do it for cheap, it probably won't make sense to get a robot involved.
Probably won't help with any of those folks opposed to UBI because "people get meaning from work." Proponents of that view must know a hidden trove of self-actualized retail workers.