People have been pulling that BS since 2 seconds after electronic ticket sales started in the 90s. 100% guaranteed the venues are in on it, too.
Earlier this month, I bought tickets to the Houston Rodeo about 4 hours after they went on sale. Except that on the Rodeo website, they were basically sold out except for single seats and super expensive suites. I go to Seat Geek and pay face price for 4th row seats. What scalper in their right mind would buy thousands of tickets and then resell them for a loss on the same day they went on sale for an event that's 2 months away?
Nah, the venues are diverting blocks of their tickets to those marketplaces. And it's usually face or cheaper so I guess people like me will think they got a great deal and tell all their friends. I don't buy tickets for anything anymore without checking stub hub and seat geek... it's really freaking obvious, IMO.