Growth of the trust

Ok, suppose I've set up the Mars Colony Trust I've described. How might it go? Think of kickstarter but not requiring a funding goal...

10 billion hectares are for sale at $1 each. One person opens an account for $10 and purchases 10 hectares. They add a $2 sell order for 10 hectares. Evergreen account report...
Trust amount: $10. Members: 1. Payout: Zero
Orders:
Sell 9,999,999,990 @ $1.
Sell 10 @ $2.

I buy those 10 hectares and issue a check...
Trust amount: $10. Members: 2. Payout: $20.
Orders:
Sell 9,999,999,990 @ $1.

The person gets the check and cashes it. "Holy crap, is this for real? I just doubled my money?" but being cautious they only buy another 10 hectares but also get a bit greedy...
Trust amount: $20. Members: 2. Payout: $20.
Orders:
Sell 9,999,999,980 @ $1.
Sell 10 @ $3.

I'm not buying at $3 because I know: Sell 1 @ $1,000,000 comes next, so the order sits for a while until they change it to $2 and I buy and issue a check...
Trust amount: $20. Members: 2. Payout: $40.
Orders:
Sell 9,999,999,980 @ $1.

When they cash that next check they think they've got it figured so they buy 100 hectares adding another sell order...

Trust amount: $120. Members: 2. Payout: $40.
Orders:
Sell 9,999,999,880 @ $1.

Sell 100 @ $2.

I've only got $60 left in my monthly budget and issue the check...

Trust amount: $120. Members: 2. Payout: $100.
Orders:
Sell 9,999,999,880 @ $1.

Sell 70 @ $2.

Now they're mad. They invested $120 and only got $100 back. They don't even notice these are no fee transactions as they would be with any online stock broker. Now a new month comes...

Trust amount: $120. Members: 2. Payout: $200.
Orders:
Sell 9,999,999,880 @ $1.

Sell 20 @ $2.

The trust hasn't earned any interest because $1000 increments will be invested at a time and even if we'd have had that an investment month had not yet passed. Meanwhile two more people stick their toes in the water...

Trust amount: $140. Members: 4. Payout: $200.
Orders:
Sell 9,999,999,860 @ $1.

Sell 20 @ $2.

2 x Sell 10 @ $2.

Now the end of the month is a bit away but I'm acting like a market maker to provide liquidity at this early stage of the game (until interest earnings can take the pressure off me) so I decide to go ahead and buy those orders...

Trust amount: $140. Members: 4. Payout: $280.
Orders:
Sell 9,999,999,860 @ $1.

Since I bought all hectares the issue of order execution order didn't come up. Normally, first timestamp goes first, but in the early stages it's too easy to game the system. Sell huge amount @ $2 with the earliest timestamp means nobody else can play until all of huge amount is sold. Giving priority to smaller trades solves that.

What kind of monthly interest will $1000 @ 5% annual produce? Should I invest $1000 in the trust before opening it to the public? $25,000 would be better, but I can't swing that. Basically I'm giving away free money, my own, until enough money is in the trust.

5% / 12 isn't right, but just for giggles that would be $4 per $1,000 per month (2 extra hectares bought from what I'd be budgeting.) Hmm... that would mean $50k @ 5% for 100 hectares per month at $2? How long would that take? Depends on the assumption. If only one person spent $50 a month to get my $100 it would take 84 years. If more compete for my $100 it would take less. Much less if presented right. The fact is everyone would doubled their money until the trust is fully funded and then a normal market takes over. $2 a hectare seems cheap.

Definitely got to talk with the lawyers about this. Roadtrip in 9 days. First stop Phoenix.

Update: Gaming the system.

Suppose they understand that smaller orders execute first so they try repeating a Sell 1 @ $2 until they get all my money for that month? Not going to work. Each person will only get one order at a time and changing an order changes the timestamp. But also I can wait until others put in the same order. Then all will go in timestamp order and I wait again for multiple orders. They can game, but I do not have to go along with it.