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This was actually mentioned in a recent "Escape" article about airport hacks and getting a free upgrade. The only downside, according to the author who claimed to have a very high success rate, is the embarrassment at getting called out by the FAs and sent to your allocated seat.I've seen that one a number of times when paxing. Generally someone boards quite late, wanders into business, and simply takes an empty seat. I've never seen it work, but I guess it must for them to keep trying.
I do the same. Works maybe 90% of the time.I usually close the overhead locker after I stow my bag(s) to discourage anyone else from stuffing their bags in the same one.