We are talking about legalizing prostitution so I fail to see why you keep bringing up elite call girls which will have no place in a legalized setting. In a place like Ohio maybe some girl who isn't even all that good looking can get a few hundred off a guy as an independent contractor. Put that same girl in Amsterdam and she won't make enough to even live off. In legalized settings the girls are kept in lots, paid less, treated worse, and well who wants that lifestyle? Very few but the most desperate. Thus the trafficking.