Of course not. But they are a sign that professionals, who literally put their money on the line, think the company is getting more valuable.
It's not their money. It's your pension. They get paid regardless.
The other guy joked about Blackberry, because even as the US and Canadian markets were dumping Blackberry, the company continued to see some nice growth overseas, which also led to record sales, profits and so on. But it was obvious Blackberry was fighting against time with the iPhone destroying its core markets.
Most investors didn't see it at the time either, because they were just following the "positive quarterly results," much like Blackberry's leadership was.
Citation?