>>11833242You are thinking of forex or crypto markets that are facing a lot of competitions and doing so would indeed open up too many arbitrage opportunities for this deal to be widely available on any significant time frame. I'd sure sign that contract.
In the case of stock markets, these products can often only be traded in national exchanges. In the case of stocks with lower volumes, the company would benefit from a lower spread to encourage efficient price discovery. There is also a national security interest to keep ownership of these stocks within the borders.
I use rebates as in reduced fees compared to competitions. I think you understand it as negative trading fees.
Why would you enter a trade, if not for a positively skewed odds for winning? Are you a loser ?