I'm one of those sng grinders. i ussually multitable the $1.10,$3.25, or $6.50 45 man turbo.
i found the 45 player format the most easily profitable format, its more top heavy of a pay structure but if you multitable these sngs you will just need to get a couple of deep finishes to profit.
i tried the 9 player sngs but i dont like the pay structure there. it might be that 33% of player get paid but finishing 2nd or 3rd really isnt that much of a pay out.
in opinion i rather spend $1.10 and try and win 1st in a 45 player sng to win $14, instead of playing a $1.20 9 player sng and only win like $3.50.
but everyone has their own preferences i guess.