If everyone used 5x the bankroll would "appear" 5x larger and would allow for 5x larger wins/losses, so if everyone used 1x the result would be exactly identical as before if the maximum wins/losses were 5x larger.

hey,Heretik!
in short: yes,you right,margins help you to increase your proportion of the Global Bankroll
it gives you an opportunity to earn more,but the risks are there as well:any whale that is lucky can dent your investment more if you are at ,say 5x margin
but,10x for dice and 5x margin for the rest of the games is the margin almost all of the investors use
you can read more in detail here: https://bitvest.io/investing   with math,examples and stats