Hmm. I've had to keep up a suspension of disbelief as the question sometimes rears itself in my head, why can't they just pay someone to serve them alcohol? Why did Hinata need to just hope someone would buy it for her earlier? Maybe there's a restriction that they can't coerce a human into doing it, they have to do it willingly? But there's been some other forms of coercion here, why not pay someone to be willing?