1. My day job (as a programmer in Silicon Valley) already pays a lot, and I expect the pay to increase over time, but if the ratio of [prostitution pay] to [day job pay] was as high as it is for most people, then, yes, I think it'd make sense to do that.
2. If a whole lot of them did that, then I expect the price would drop a great deal, so such a campaign might be dishonest—well, actually, in some respects that is like a stereotype of a STEM campaign, with some companies bemoaning how hard it is to find talent while not raising their low wages. Other than that concern, yeah, I'd be happy with such a campaign.
3. I don't have children of my own yet, but I have sisters and a niece and female friends, so I will imagine them in that situation. I would have two concerns: STDs and hard drug use. For the first, I would look up some statistics—e.g. flying on a plane feels a little viscerally unsafe, but in practice it is pretty safe—and the practices of the Nevada brothel in question, and let's say that I'd conclude the STD risk was negligible. For the second, I would make certain that my child (a) knew about the risks of various drugs, (b) was prepared to deal with pressure to take drugs, and (c) knew that she could leave at any time and come back home.
After those concerns were addressed, yes, I would consider it an interesting experience for my child to have. Lucrative, get to see a bunch of people in an unusual set of circumstances, probably get practice in negotiation and in reading people, etc.