Interesting Price Differentiation

This may sound morally wrong, but I thought it was interesting to see the price difference in prostitution.

Here is an article about a sting in Bloomington Minnesota where you could get "sexual services" for $40 or $160 and hour (if you need that long).

Here is an article stating Client #9 went with a high-end vendor (i.e. Emperor's Club) and paid between $1,000 and $5,500 and hour.

I'm sure prices on the East Coast are inflated a bit, but I'm guessing the differentiation is primarily due to perceived quality.