I guess it depends what making webcomics is to you! When I get down about the numbers, the time spent or the money spent on materials, ads, etc, I remind myself that at the heart of it I just wanted to make a story with my best friend and have a creative project to occupy my time. While it would be fabulous to become an overnight success, the amount of readers or money made really didn't factor into our decision to make a comic. 5k over 2 years is less than some people spend on their own hobbies like shopping or clubbing, going to plays or on ski trips. If you have fun doing your comic, that's what matters. But it is sounding like you see it more as a chore, a losing investment and a source of stress and disappointment. If that's the case, there's indeed better ways to invest your money and energy - into something that makes you happy.