In omaha tournies...

[GeoffM]

Early, when still at a 10 seated table, I will only normally play suited aces with any 3 to the wheel. Of course, I will also play all high cards if I have a suited ace and will play AA at least for a flop.

If you're talking sitngo, then shorthanded O8 is a completely different game. More about buying position and free draws, and you can loosen up a bit and play a variety of other hands you would never consider.

Dominantly though, a good tourney, you will normally see about 20% of flops, and certainely you don't want to see more than 30% MAX.