Because when someone on the inside puts that kind of cash of their own into their own stock, it's because they know something. And it's okay to trade on inside knowledge, as long as it's done publicly, with notification, which was accomplished by his filing. This kind of investment wasn't done with a 20% maybe/possibly-it'll-go-up in mind.
His investment is pretty much a guarantee of no shenanigans with dilution, a R/S, etc.
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