I wish I had the know how and the cash to set up a similar shop. We pay for the quality. I buy from Phong and Minh because of quality. Often, I will try to grab an all-built Franken here on the for sale section.
We all started with the cheap $150 sub or cheap Daytona. on day 1, those cheap bastards were as good as gen. However, as time went on, we could not live with the flaws so we moved up to better quality, less tells. That has a cost. The cost is Phong and Minh.
A group buy with this amount of cash involved is a disaster waiting to happen, IMHO.