"The third thing that goes wrong when you take your toy too seriously is that you immediately start optimizing on the things that you believe serious businesses

"The third thing that goes wrong when you take your toy too seriously is that you immediately start optimizing on the things that you believe serious businesses should – profit and margins." This is of course only true if you're playing the Silicon Valley VC game, a lot of healthy businesses has been built by focusing hard on turning profit early. For an example from recent news, look at IKEA.