I am not sure about all that, and that's not what this site is about.
It's nobody's fault here that an item (or any item) on eBay sells or doesn't sell. The folks you think are getting "the scoop" here are probably already monitoring specific cues on eBay and would get them regardless of whether or not they are posted here. There are a lot of "players" in the game of pool cue arbitrage so when a cue comes up on eBay that is either rare, or priced under market value, there are always a number of folks competing.
I'd also be careful of accusing the subject matter experts that you might need to answer your questions.
The folks here answering the questions are indeed experts in the area of pool cues and look at hundreds if not thousands of cues a week. Those folks will always get the deal before others (who might waste a day or more posting a question, waiting for a reply because they don't have specific knowledge on a particular cue or brand). It's the nature of arbitrage in any industry - those who have the knowledge, have the advantage, and that isn't unique to this site, etc.
This site and the knowledge is free for all. The information and efforts are "paid for" by the value each question has to the future visitors looking for the same info. If someone posts a vague question with no photos or context, it is useless to anyone visiting after the fact, and adds zero value to the community.
Hopefully you'll continue to post quality questions and perhaps even contribute some of your own pool cue knowledge when and were you can.