Feature request: allow fiat-pegged stakes

The potential gains from large stakes make it appealing to commit substantial time to the Numerai project. On the other hand, exchange rate volatility between NMR and USD / GBP makes it unappealing to commit large stakes. If stakes (and, ideally, payouts) could be done in one (or more) fiat-pegged currencies, I think that would encourage more people to participate and stake substantially.
As an aside, about the philosophy of the payout system: What does Numerai-the-hedge-fund-manager gain from users committing large stakes, and hence earning more? Numerai gets the same predictions whether they’re staked with 1 NMR or 1000…