I did once pay a deposit in order to secure an appointment with a lady touring to a particular place for just 2 days and whose services I was interested in trying. I did a lot more due diligence than reading a few AW ratings! She had a long track record with reports on several other sites. I wasn't particularly happy paying it but it was a small portion of the fee, I think it was £40 and the total for 2 hours was going to be over £200. It all worked out fine. My main worry was not that it was a scam, more that if I had a genuine reason to cancel I'd still probably have had to forfeit the cash.
These profiles absolutely scream scam to me. I can't imagine anyone ever leaving feedback where their primary point was to stress how they had paid a deposit.