From the 2015 Pre-Money Conference in San Francisco, VCs discuss the challenges of a crowded startup environment. Panel: 500 Startups, Dave McClure, Founding Partner SoftTech VC, Jeff Clavier, Founding Partner K9 Ventures, Manu Kumar, Founder & Chief Firestarter Rivet Ventures, Shadi Mehraein, Managing Partner Homebrew, Hunter Walk, Partner