My problem with what I colloquially call the Nevada model is that it seems to inherently serve the wealthy in the way it is set up. If prostitution of this fashion comes to be but only serves the upper echelons of society then what's left for the rest of us other than to continue the old ways?
That is one of the inherent problems with legalization - it raises prices and only people with money can take advantage of it. If a woman is advertising on the internet, she needs to pay for a website, an apartment to meet people in, etc. If it's a legal and regulated industry, there's additional costs for making sure the place is sanitary, keeping proper records, getting licenced and all that. You're probably not going to have a licenced and regulated prostitute hanging out on a street corner and giving blow jobs for $20 and you're likely going to need to spend at least a couple hundred dollars to see her. If that's not in your price range, legalized prostitution doesn't really help you and the only people catering to your needs are the sex traffickers because not having to pay the women or make sure they're disease-free or alive at the end of the night cuts expenses.
While there is, of course, an inherent inequality in that, this doesn't therefore mean that you can't make this aspect of the industry as safe and secure as possible anymore than you're hampered in making safety standards for cars because there are some people who can only afford to take the bus.