This isn't a "group buy," ftr. It's just being called a that to generate a sense of scarcity and exclusivity -- successfully, it seems.
A group buy is when people - not a company's sales reps - shop around and negotiate for a custom production run. In exchange for terms the vendor is guaranteed a large sale. And if the product is shitty, the vendor risks losing the entire group's business... so they have extra incentive to not fuck it up.
This? Just a sale. There's no purchaser leverage here, and zero real difference between this and the 30mg on the price list right now. Is it great that Tracy is covering a certain amount of independent testing for this batch, and asked the factory to add a lil extra? Sure is! But he could do that for any batch any time he wants.
Don't get me wrong, it's a good sale. But that's all it is.