The cost of trading is small for a reason.
And what reason is that?
Stock indices easier compared to what exactly?
FX, commodities for example.
In theory, the easiest market would be very directional going from A to B in a linear fashion with zero noise. In practice, stock index futures are very different from that and generally are very complex instruments by design.
Look at monthly chart of SPX and show me another instrument in another asset class that has trended like that.
Stock indexes are the only asset class that has a fundamental reason to rise forever due to the simple fact that people go to work everyday to generate profits for a company listed in an index. So a stock price can't be flat forever can it, otherwise that company would be free at some point. And i doubt a whole index will go bankrupt
So, what makes it easier in stock indexes is the fact that you can ONLY take long signals whereas you can't do that in other assets. Isn't that a statistical edge in your book? Or you have a better instrument in mind?
I guess you all are referring to 1min charts and daytrading only. Even though OP didn't specifically mention short TF's.