the pull stacks..

you do 1 free draw stacks up until you get orange summon either at 50/60 pulls.

so if you do 1.1.1.1.1.1.1.1.1.1.10.10.10.10.10(orange).10(lvl5 rune).1.1.1 and it continues.

the reason people doing 10 pull nowadays are during events where they get extra summon scrolls during rebate / to complete monthly quests 10pullx2 to get the points. So regardless you doing 10 pull or 1 pull you will still get the orange summon i haven't encountered anyone not getting any at those numbers.