I have just rejoined the discussion, so forgive if I say something that has already been said...
I have believed for quite some time that the numbers, post-pandemic took a shift to the worse for SD advantage -- in other words, for a variety of reasons, there really isn't a 6-or-8-or-10 to one ratio of women to men.
Like Sweetman, I live in pussy Siberia, and I would guess that 10-15% of my last search (1309 profiles within 80 miles and between 20 and 43) are really motivated to try to put together an arrangement that involves regular intimacy at a non-GPS price and who will be motivated to grow the relationship. That last bit is important, because I do believe that there are a significant percentage of women who are OK with BCD activities, but will not put the effort in to make repeating and growing the relationship worthwhile. In other words, they are not SBs -- they are escorts, semi-pros and random chicks with a current pressing financial problem. Add these women to the scammers, flakes, GPS chicks, lurkers and bots, and it will be WAY more than half the profiles in a normal search -- and I would take an EWAG that it's 2/3 of all profiles.
Then, there is the problem that Sweetman points out. I cannot tell you the number of times I hear that women are "overwhelmed" with the number of messages they receive. So a certain percentage of the new ones get run off in the two days after they sign on. Even very together women lose track of sincere, experienced SDs in the noise of the site. this may not be a big deal in large markets, but Sweetman's comment about a 3 month conversation really hit home with me. I would guess I get a couple of messages a day from women that I have not corresponded with for more than a week. There's so much noise on seeking that it is impossible for women to sort the "good guys" and keep track of good conversations.
And finally, there are enough guys overpaying out there, that most women who have been SBs before have had offers, dates and even arrangements at ludicrous numbers. I had coffee with a 35-year-old mother of two last month, who was 35-40 pounds overweight, and a little edgy. I wasn't interested, but I didn't tell her that, and she led the allowance conversation. It was clear that she expected about $500 a date and gifts and dinner out. I should disclose that my last three arrangements have been 200 at her place with a25-year-old single mom that can suck a golf ball through a garden hose (35 dates); 250 at her place with a DDG 22-year-old with an equally beautiful perfect curvy body (21 dates); and 200 at a hotel with a model material woman that is top five all time (tomorrow is our 22nd date). My point is that I texted last week with the 35-year-old-wanting-500 woman and she has found a guy, 48-years-old giving her 400 to have dinner with him. No sex...not interested. She says he's very interesting...I bet he is -- she's getting wined and dined and paid a couple hundred an hour for eating. My point is, that there is a definite skew towards crazy money, and that makes the portion of the market that good experienced SDs are actually interested in, skeptical about talking to us. The guys that overpay have created a communication barrier with a number of women by creating the perception that SDs looking for long-term, stable growing friendships are actually cheapskate lowballers.
So, I agree with Sweetman, and add a couple of other categories. I think one of the reasons it's harder to find good SBs, and that there is so much "work" involved in the chase is that the number of "rational SBs" no longer significantly exceeds the number of "sincere SDs".