I only send in complaints due to misconnect and having to overnight it. Which has been 3 times in the past 3 years. Otherwise I don't even waste my time lol. I'm guessing there are quite a few guys looking for anything to write about on every one of their flights.
BTW I had my DirectTv not work last month after paying...but they refunded the charge after an email. Also my seat had a broken armrest but I didn't even think about sending in an email. Even though I was in an aisle seat. So I can see how people could essentially game the system with every little minute problem.