Doesn't matter if the glass is half-empty or half-full. All that matters is that you are the one pouring the water.
Mark CubanDon't start a company unless it's an obsession and something you love. If you have an exit strategy, it's not an obsession.
Mark CubanHaving the ability to be brutally honest with yourself is the greatest challenge you face when creating a business model. Too often we oversell ourselves on the quality of the idea, service, or product. We don't provide an honest assessment of how we fit in the market, why customers will buy from us, and at what price.
Mark CubanDo the things that make perfect sense to you, [and] don't be afraid to shout it from the mountain tops just because it's outside the box or against the grain in your industry. More often than not, you're probably going to be right.
Mark CubanOn the Internet, there are an unlimited number of competitors. Anybody with a Flip camera is your competition. What makes it even worse is that YouTube is willing to subsidize the cost of your bandwidth. So anybody can create and distribute for free basically, but the real cost is marketing. And that's always the big cost - how do you stand out and what's the cost of standing out? And there's no limit to that cost.
Mark Cuban