Nothing really. The best that can be done is to limit entry into the club to try to circumvent perceived issues. It is hard to do and no one much cares for it one way or another but regulation exists for a reason. It is nice to know that people are looking out for a collective interest. However, douchebaggery exists, can't change what has been a couple million years in the making over night. Perhaps we could hunt them down though, if they left a digital trail, if there is a will, there is a way, or so i like to believe.

If you wanted, trust would be a function of time and contribution. Both weighing heavily on how much trust one has. If that makes sense to anyone else anyway. It isn't that it wouldn't or that it couldn't happen even with a considerable time investment, it just looses it's appeal with the more time you have to sink into it, unless it becomes that much more rewarding, the scam.

I think general 'gut feelings' are going to keep most people in the clear. The person who makes a handful of fractional trades, then wants to buy 9 btc worth at once, nope, something stinks to the high heavens! I do believe, if the trust is there, founding members would be willing to do some type of escrow if it were to be desired. The community is generally more than helpful in that fashion.