For everyone saying they shouldn't bluff often in omaha, how often do you pay attention to the "Fold to Turn Bet" and "Fold to River Bet" percentages, especially at the micros?
A lot of players are chasing, but they're also folding a lot more often than you think. It's not unusual for me to see players with 60%+ on the turn and 70%+ on the river. Many are a little lower, but most are still folding a lot of the time.
The main thing is to try and figure out what sort of hand your opponent is playing and give it a shot if they appear to miss and give up. You'll get weird calls/raises sometimes but you should get enough folds to make up for those spots. You can't abuse it every time, but it should definitely be something you're doing short-handed.
I don't suggest bluffing into a 5xbb pot where all 5 players are still there at the river, but against one other player (sometimes two), it should at least cross your mind to throw out a good sized bet at a medium sized pot everyone gave up on. Or, if a scare card comes and the opponent shuts down, then you may be open to take it yourself
Edit: A typical "nothing" hand where a small bluff gains some bb/100 is here
Hero (BTN): 277 BB
SB: 512.4 BB (VPIP: 60.28, PFR: 28.37, 3Bet Preflop: 11.11, Hands: 142)
BB: 87 BB (VPIP: 43.70, PFR: 0.00, 3Bet Preflop: 0.00, Hands: 119)
CO: 158.6 BB (VPIP: 32.93, PFR: 2.50, 3Bet Preflop: 3.70, Hands: 82)
SB posts SB 0.4 BB, BB posts BB 1 BB
Pre Flop: (pot: 1.4 BB) Hero has A♥ 2♦ 4♦ 4♥
fold, Hero raises to 3 BB, fold, BB calls 2 BB
Flop: (6.4 BB, 2 players) 7♠ 3♠ 9♣
BB checks, Hero checks
Turn: (6.4 BB, 2 players) J♥
BB checks, Hero bets 4 BB, BB calls 4 BB
River: (14.4 BB, 2 players) 3♣
BB checks, Hero bets 9.2 BB, fold
Hero wins 13.8 BB
Just me, one loose passive guy, and he's also folding the river a lot. So, when I don't get raised on the turn I can be pretty sure he doesn't have T-8 and he probably has a pair or maybe the flush draw. Or, he might have nothing and just not believe me. The river (which he is folding 60% of the time over this small sample) doesn't help much aside from sets that would have raised/bet or random 3xxx hands. So, a 2/3 pot sized bet and he gives up. This is more typical than it is to be called down. If he shows up with 8-3 or something, good on him.