""(If cdu is a dead stock, why all directors keep on buying? If cdu die, cdu directors will be the stupidest guys in the world. Otherwise , the shorters are the stupidest in the world.)""
Perhaps,....a bit of both.
But don't bet that every time some company Directors buy into the company they run, the company will invariably turns out to be successful.
Dyor properly, and you will be surprised at what you will find if you do!