No, it shouldnt turn into a flame. I have been to that thread, and it is asking peoples opinions. It's simple physics, that as things get hot they expand and as they cool donw they contract. Maybe it's the other way around, not sure, but they still expand and contract. It's simply not good for them in the long run. It might be a nominal difference, may be great, it is dependant on so many variables. The safest thing is to just leave it on all the time, if you have adequate cooling and dont care about your power bill going up. But like Joe said, there are advantages and disadvantages on both sides.
IMHO you should turn it on in the morning, and off at night, if off at all.