The trick is "Don't stop playing games!" :) Most people who burn out on a hobby because it's also their work do so because they drop the hobby for being too much like work. If you power through that first few years of "Arrrrgh, my hobby has become work!" panic, it goes away. It's replaced by confidence that you're better at your hobby because you're a pro, and better at your work because you're taking extracurricular classes in what you do for a living.