Quote from Rationalize:
What he said.
Also .. if you have a HUGE edge, that happens to skew the odds 51/49 in your favour .. but then you scale your trades by paying another transaction cost, and another, and another .. you will be diluting your edge.
So you're at 50/50 minus costs...
Do you feel lucky?
Trading multiple futures contracts or blocks of stock shares all-in or scaled in makes no difference in overall round-turn cost.
Commission structure based on per-contract or per share makes zero difference on how the entry and/or exit is executed.