The amounts would need to be very small and you would likely not get paid unless your trade were to actually get filled.
Yeah traders get paid only if their trade get filled. Do you think this model could be an incentive for market makers to get the exchange's order book filled ?
This model would fit the definition of incentives for an exchange to have a larger/deeper order book.
Would exchanges need to do this in order to get people to trade on their exchanges? I don't think so as there is enough of a demand to trade bitcoin for fiat as it is.
An exchange need liquidity provider. As soon as exchange run dry on order book, traders will move their money elsewhere.