I read through here and I am not sure what has or hasn’t been tried, but I wanted to share a couple of thoughts. First, as long as something has value, someone is trying to figure out how to get it for as little as possible or even free. One of the unique, but not exclusive things pool has as a hobby is more people play pool in a business sometimes with their own equipment and often with other people. Even though I wasn’t personally involved in pool for the last few decades, I understand the basics as it relates to a hobby or for some a deeper investment of money and even more valuable , time. Some people owned pool rooms and in many they had a person who did repairs and they sold cues/butts/shafts or allowed other people to sell items there in the pool rooms as well. This method of commerce wasn’t broken, but people pioneered selling from a computer screen and that became popular (convenience being a big part) and eventually online sales became mainstream. I know, get to the point. I only see two solutions. If you want to be a seller, at a minimum have a DBA (doing business as name) and be willing to publicly list at that business name, your name and a contact number. Most of you have your information all over the internet already anyway. Another idea, designate a couple of people (confirmed members) in each major city as brokers. Again they would have to be willing to provide some basic, but verifiable information and they can act as a go between buyer and seller. If you are the buyer and seller, give a small convenience fee (perhaps even extending there silver/gold status on AZBilliards) to the person assisting with the transaction. If you are a “broker” maintain an account with positive feedback through the website. I know I am a newby (some people are keen to remind me), but I am still part of the pool playing community. As with any hobby we can make it shit and contribute to people avoiding getting involved/invested or we can contribute to promoting a supportive, inclusive community that values a cool place to be involved and conduct transactions. This free advice can be used in about any discussion board ever made for almost any hobby that has buying/selling.
Edited: fixed some grammar/spelling