One thing to consider which im sure many of you haven't, what if the exchange gets hacked and a lot of funds go missing?
All those that join the group buy could be joint liable for the missing funds.
Wouldn't be the first or last time its happened.
1) You're not liable
2) Raise enough funds for a security audit of the code, and servers. As well as a crowdcurity campaign.
I believe this site has already been checked by crowdcurity
In regards to the OP:
Even with a few thousand in advertising and a good platform, and 0% fee's you are unable to get daily volume over a single bitcoin and change. Do you see why this is worrisome? Huge. Huge. Moneypit.