It depends on a number of factors as well as combinations thereof, so there's no simple answer. Also, higher isn't necessarily better. If you play to raise your ITM % by tightening up near the bubble and pay jumps, it's likely that you'll win less money over the long run because you won't go really deep as often, which is where the large payouts are.
A simpler factor is what the payout structures are in the games you play. As a simple example, if you play 6-man SNGs where 2 get paid, the average ITM is 33%, which is unsustainable in tournaments where the pay table is such that only 10 or even 15% make the money.