very large field tournaments reward aggressive chip accumulating play more, since even though there may be as many as 2,000 entrants, the payout structure dictates that the big money is bunched up in that little final table. reaching it requires earning a whoole lot of chips... a lot more than you can expect to earn from just playing big hands and doubling up with them
on the other hand, take a single-table sit 'n go to represent the opposite extreme. here, tight play is very much rewarded because to do well in a SnG you generally need only to double up a couple of times, so you can wait and pick those spots carefully. and sometimes just from using that tight image to steal a lot of blinds in the late game, you can earn yourself a spot in the top 3, if not win it outright
small field MTTs are of course bigger than a single-table SnG, but the same principle applies, just to a lesser and lesser degree the larger the field gets