Artists and promoters routinely withhold tickets and resell them through secondary ticket marketplace Web site StubHub.com, even though they do not disclose that fact to the public, according to StubHub communications head Glenn Lehrman. In an interview with Evolver.fm, Lehrman made clear that ticket resellers are not the main reason for high prices, instead stating that he does not believe the use of software bots — software that can surreptitiously scoop up large blocks of tickets — is nearly as pervasive among brokers as reported. Unfettered marketplaces like StubHub simply reveal what fans are willing, or not willing, to pay for tickets, and a lot of the blame for why prices are high can be laid at the feet of artists and promoters who only release a percentage of available tickets to the general public. "I can tell you for a fact that I know a number of artists and promoters list substantial amounts of tickets for their tours through StubHub, because that’s probably what they want to charge for a ticket, but can’t do so publicly," he said.