Well yes i personally do! I wont do it again here though!
As a sales person i think like this:
He made a thread and hasnt been here since June.
Although he does not post or come here, he will receive an email notification of the PM or reply. Therefore he will see my offer. And he is likely still in business since he had stated he has a call center with employees, meaning he is a not a start up or one man shop.
So by sending a PM or reply I get a direct message to his inbox with my offer relating to his needs. If he is still in business he surely still has those same needs in his niche. No one runs out of leads.