Spent 3 months on SA, then decided to try SB. Really just the difference of paying by the month or by the individual contact. But SB really didn't work for ma. I couldn't understand why so many women would message me, then never respond when I answered (each "first" answer to open a dialogue cost 10 credits). If I answered 50 messages, I would only get a second message back from maybe 1 lady. Now, understand that there are no additional charges once a dialogue has been opened, so there is no incentive to SB after the initial message, which is where their money is made.
So, I decided to quit SB. After my credits had all been used up, I posted on my profile, in all CAPS, that I was out of credits, had had little success, and would answer no more messages. Guess what? I got 8 messages the next day. It was exceptionally rare to get over one message a day, but 8? Unreal. And I had posted clearly that I would answer no more messages.
I wonder if SB has a staff that posts messages from fake ladies to get guys to spend their credits. Most of these initial messages were very short, like "let's talk" or "Hey, honey", and the profiles themselves on these ladies were very short and contained almost no information. Certainly some of the ladies are real. I have had some success. But at this point, I suspect the bulk of the profiles were actually posted and managed by SB staff.