I was the offender a couple times when I first started golfing and didn't know any better, and I felt like a complete idiot. Since then, I don't touch a ball on the course unless there's absolutely zero chance that it could be anybody else's ball in play. I just don't want to be "that guy".I've lost several balls over the years to people picking them up, and I'm sure I have been the offender a couple of times as well.
But in the last 6 or 8 years I haven't bothered to pick up a "lost ball" in a fairway. I'll leave them for someone who needs it more than I do.