My experience has been negative:
-most of the women do not want to have any type of sexual relationship. They really think that men are going to pay them to take them to movies, restaurants, etc. I met one and we agreed upon $300 per meeting. When I later sent her a text telling her which hotel I had booked, she said: "wait a minute, a hotel? I thought we were going to have lunch." A lot though, are clear in their profiles: "About Me: I am a young blonde girl that loves to shop and hangout with friends. I used to be a dancer therefore I am athletic and love to hit the club to go dancing. On the other hand I am smart, currently completing a high level of education, so I am quite dedicated to what I do. I also love to meet new people and explore different places and things. / What I'm Looking for: A sugar daddy that I can keep company every once in a while, nothing serious. NOT WILLING TO GIVE ANY KIND OF SEXUAL FAVOURS!!".
-Similar to oagre's experience, when I said an amount to one, she said: "I think you are looking for a cheap whore." When I asked how much she was looking for, she indicated a higher amount. It was the "cheap" part that bothered her.
-Several women were clear that sex would be part of the date but wanted high amounts: ie. $500 and two said $400. One even wanted $1,000 and she was one of the least attractive. If they were stunners, then I would have gone along with it, but they weren't. Basically, if they were into sex, they wanted a lot and weren't that hot. If they were hot, they felt their presence alone should be enough.
-most want monthly amounts paid up front. I explained to one that I would rather pay per meeting because otherwise she might take the money and never see me again. She said that I should understand her concern that she would receive the monthly amount. She faced the classic problem: if I was stupid then I wouldn't have been able to accumulate money in the first place.
-I had a few no-shows. One even confirmed that very morning and then didn't show up.
I also tried whatsyourprice.com and it was similar.
Also seekingarrangement is $110 per month to join.
I was hoping to meet some really hot women and I was willing to pay premium amounts, but it didn't work out.