That's very inspiring but are you talking about something like US $300000/year? Or are you in a low-cost-of-living situation... US$30000/year? "3x the money you make a normal job" could mean a lot of different things !
For me I tend to earn between 120k and 240k USD / year, but I only ever work part time on that job, I used to just spend about 3 months of the year on it, but during those 3 months I would do 100 hour weeks. I'd spend the rest the time traveling for fun. If I was working full time constantly it would be double or triple that by now I think. Right now the sales are slumping a little, but that's because I'm neglecting that work a bit while I pursue my side passion a little more (which will hopefully become profitable later).