Why let users declare a value at all? If you really want to do something like this, allow users to declare offsite addresses, and require a signed message for verification. Then, track the balance of those addresses.
I realize it's a lot more work to implement, but it makes things a lot more honest.
He already stated it's not about honesty. It's about options.
i.e., I can have 100 CLAM but have enough fiat sitting aside to buy BTC and then convert that into CLAM to buy another 900. So this would allow me to claim I have 1k, and if needed, I can do the purchase to replenish my losses.
Or I could just be a big risk taker that has no issue losing it all on one bad roll, but still want the ability to earn a lot more if things go well.