If you wait for those tests, you might miss out. The tests usually come after shipping. There are vendor tests, vendor-sponsored tests, and buyer-paid tests. Recent buyer-paid tests have shown good results for sterility and endotoxins.
Usually, they set up groups for each product batch, and someone leads it. You'll need to join the main Telegram group, then get invites to the other testing groups.
You're talking about one group, not the other. Also, the goal isn't "pay to play." Results are shared. The groups wants people to watch and learn, even if they aren't buying. It helps with vetting the product.
I'm in on the T60 testing, and they did have a direct payment link. There were like 70+ people, so it was about $11 each - I actually donated a vial instead, which was worth more.