A good friend of mine is a successful start-up founder. He recently took a real job with a proper salary. I asked him why he did it. “Ten years of start-ups, Stu. It nearly killed me.” He’s not alone. I have written before about entrepreneurs’ disease and what it actually takes to build a company. Hustle culture gets a bad rap these days but I never met anybody who made a success of anything who didn’t have to grind it out. Clearly there are downsides to hustle culture, which include exhaustion and your self-worth becoming hopelessly entwined with your professional…