I've beenn FF'd many times over the years I've FF'd a few players myself. It makes me glad the bullets aren't real.
This year I've played but 10 days, 3 of those I wasn't FF'd even once. The three days I wasn't eliminated by FF were at a field that isn't the cheapest in town by a longshot. The average player there is older and (based on conversation and observation) possessed of greater experience. I fear there is a strong correlation between these factors and restraint/judgement. I expect I'll be playing more at the expensive field next year.
I think most PUGs lack planning and communication. I expect this is the appeal of having a team. To reduce the instance of being teamshot forgo cammo for a distinctive color combo. Everyone will know it's you whether friend or foe.