Yeah that's fantastic! I'm a huge proponent of diversified streams of income, and the low barrier to entry means people can try it out with little investment and a little elbow grease. If that can bring in xx% of your full-time income I think a lot of people would call that a win.
It is my entire job, brings 25% of what I used to earn 8 years ago (never mind what I might be earning now) and I still call it a win ;)