I see that a good number of ladies on P411 rarely log into their accounts. I typically pass over those as options because I think they'll be hard to contact or take too long to respond. Of course it's a moot point for ladies I already know and so have their phone number.
It could be that ladies who rarely log in are just happy with their regulars and are not seeking new clients. For those that do want new clients however, it would seem to be wise to log in more often.
BTW this post is not referring to anyone in particular, just something I noticed over time.