How much loyalty do you feel to your job and your boss?
For example let's say you're working at your dream job but the rest of the employees there are miserable and they decide to stage a revolt and start their own new company and they want you to go with them. Most of the company's important clients/customers/investors have already committed to going over to the new start up and they offer you a higher position and more money than you're making now. You like your job and your boss.
What do you choose, continuing with a well known company where you're happy, or move to a start up company?