I have considered this type of group buy before, but always failed in that point.
IMHO there are 3 possible ways to set up a group buy aimed at procuring an auction miner:
- Make a fixed price deal with owner outside of auction.
- Group buy operator carries risk.
- set up the group buy as a Share/GH buy, where the margin is high enough for the group buy organizer to alleviate most risk and as close to possible guarantee a successful purchase
Out of these 3 options only option 1 is 100% viable, 2 asks a lot from the organizer as he/she may end up in a situation where he carries a loss or has to refund share holders and 3 runs the risk of making the group buy unattractive to buyers.
I wish you good luck and hope you can find a viable solution. If you would like any help in structuring the group buy I am happy to help. And please don't take this as criticism or FUD, just feedback.
Let me try to clarify my approach:
Let´s say we have 7 Members with 20 BTC share each.
You become a member of this group by transferring your share to the escrow.
We internally agree on a maximum bid, lets say 110 BTC.
If we succeed, the very first payment will be the 30BTC remaining capital.
If we don´t we will get our shares back(-escrow fee)
I don´t see the need to agree on our max-bid publicly. I understand that you would like to know the max-bid in advance.
In this point I trust that the other member´s will have some common sense / math-skill.
Maybe a rule on how to find agreements in the group would help increase the trust.
How to vote on decisions?
A 51% majority of shares needed?
Other decisions will be necessary in the future. Like should we sell the rig and so on...