You have to read between the lines. No ad is going to literally spell out illegal activity...that would be an easy bust.
In Vegas....hmm maybe this is not the best approach...screw it. In Vegas, woman sell their bodies for money. If this lady doesn't want to do that for a living then I don't see the problem with her bartering sexual favors for baseball tickets. Granted she may sell the tickets (this is where the topic gets flimsy), I don't see a problem with this since she can't afford it. Either do away with prostitution in all of America, or allow it everywhere without a license. All the government cares about is money. The only reason Asian spas in Houston are being shut down is because they don't pay enough taxes.
So if a woman says, " I'll trade my puppies for yours." Is she really talkin about.... If someone says, " I'm creative and experienced in many trades, and I would be glad to share that with you for the right compensation." I'm offering a large-mobile wiener, half price and no exterior damage. I need someone to trade with, because I need new headlights on my car. A larger size is preferable. I need experienced plower ASAP, I had someone who wasn't quite up to the job. Need someone hard working, on time, and very strong. Please don't be tardy, but at the same time don't come to early.
Nice.. Howabout, "Wood storage. For a price you can put your wood in my shed.." "Attention spelunkers! Owner of cave now open for business. Come and explore my depths."