Well, that's what the best players do. Timed routes around a map to horde spawned weapons/items.
That said, I'm not really any good at PDZ online, but I'm still having a lot of fun with it. I was in a 32-player game of Infection last night and it was awesome. Now I just need to learn the larger versions of the maps; they're huge. Really, my only complaint about the game is the lack of any lifetime stat tracking. You get achievements for 1000 kills, headshots etc, but it's not the same. SOCOM II was the last online console game that I put a lot of time into, and PDZ just feels inferior to it in that sense.