Is that fair though? If something is only worth 5 to me and 40 to you, and the cost of development is 45 - neither of us along can afford the feature, but if we put aside out different contributions the total is enough to make both of us happy, or neither of are. Your model both of use get nothing when we both could be happy on a different model.
It is equitable, but it is not efficient. At least this is better than a Vickrey auction though, where you would only get paid $5.01 and spend $45 (net loss) rather than see the bids and do nothing. (Or see the bids and lose, but get paid $40 rather than $5.01)
