> If I don't have time to assemble the elaborate toy train set I bought for my kid, it will probably never occur to me that I could pay someone to drop in and do that task for me, even if I would happily pay someone if they offered.
That's the kind of problem nobody should ever have in the first place. The whole point is to work together on it, not just to give it. To have some stranger put it together defeats the purpose.
Unless they wanted to dress up in a three piece suit with a top hat and smoke a cigar while they watch the train set being assembled in order to live out some kind of bizarre railroad executive fantasy possibly inspired by too many re-reads of Atlas Shrugged.
Point is, the purpose of toys is to have fun. I wouldn't regard my example to be any different than spending one's disposable income on a trip to Vegas or a VR headset.
I think that's not contradicting OP's point. It's a "long tail" type of problem--nobody's going to buy a Super Bowl ad for Uber for model train assembly. Not even every model train buyer wants it. (Incidentally, I can think of plenty of situations where you would give a child a model train and not be willing or able to assemble it and still have it be a net gain for the kid).
That's the kind of problem nobody should ever have in the first place. The whole point is to work together on it, not just to give it. To have some stranger put it together defeats the purpose.