I adapt to the situation at hand. For example, if the table is tight and players are overfolding, I'd open more frequently. Conversely, if it's a loose table, I'll narrow my range so that I can exploit people playing marginal holdings.
I experienced the former situation in a PLO tournament recently that I won. It was a PKO and we got down to the final four players, and I had just doubled up against the tournament chip leader to become the overwhelming chip leader. Once that point hit, I was opening up probably 80% of my
hands because they just folded and I could pick up easy chips. If they 3bet me, I'd just fold if I had nothing, but I was still accumulating chips.
I had the good fortune of hitting some real good hands, even with those marginal holdings because even had I lost a hand, I still had an overwhelming chip lead. Also, because of the money jumps, I used ICM to my advantage. Luckily I was able to knock out the last three players fairly quickly and won the tournament. *** IMPORTANT - I ran REALLY well too which always helps. ***
I experienced the latter when I was playing for a satellite ticket, where I was in a spot where my ticket was pretty much secured, so I was folding everything. I even folded Kings pre-flop one hand, and Jacks in another.
It's all about adjusting to the game conditions you're facing at the time, which was mentioned by skalibur, lukovnikofff, takinitSLEAZEE, and marvinsytan.