Some, for example, buy a stock without doing their own DD, and then hold it for 2.5 years while it falls from $29 PPS (split-adjusted) to 0.0001 PPS -- and then refuse to buy more at .0001.
I have trouble calling that strategy "professional." If I thought there was really a buyout here -- even a CHANCE of a buyout -- I'd buy all I could buy at .0001.