It’s often said that entrepreneurs are dreamers. True. But good entrepreneurs are also firmly grounded in what’s available and possible right now. Specifically, entrepreneurs spend vast amounts of energy trying to figure out what customers will pay for. Because ultimately, the success of all businesses depends on customers willing to sign on the line that is dotted. In turn, the success of all professionals—the start-up of you—depends on employers and clients and partners choosing to buy your time.