Over winter I met a guy so I jacked my rates, time minimums, and even required a deposit. I saw no one for months and for a month or so only saw regulars. That's exactly what I wanted (until I looked at my bank account lol)
He dumped me and the rates went down for a tour. I came back and decided I wanted to see more than zero and hopefully bring in a certain amount of dough to replenish and also buy all my Incall furniture, so I did a summer rate structure. It worked great. Tons of fun too. I've noticed summer is a much tougher month for me too, so it helped a bit with demand.
Really, I feel it's more the amount you want your email to blow up or quiet down. As time gas gone, I've learned it can cause suspicion and I did get shit for telling a client that I grandfathered him in. He thought I was scamming him. I don't like that kind of relationship, so I released him to the many other beautiful ladies lol.
Anywhoo, I think we think too much about things - rightful to keep your eye out for evil, but also know ladies aren't always telling people their personal business for privacy and simply make appropriate announcements and communication to the public.
When I need a week off I raise my minimum time on all my ads - just did and had a very nice week to get stuff done.
I'm sure it is marketing for some, but for others it's not. They could also be feeling out the price range in an entirely new city/market/lifestyle as I did when I moved here. But I'm new to this as of May, 2013 so I forgave myself for my imperfections.