I roast coffee as a hobby. Occasionally I'll part out a batch in small jars to friends. At one point, several different people asked me to roast larger quantities for them, so I started charging with much the same goal as you: cover my own consumption.

Didn't work out . . . Roasting when I want to roast is fun. Roasting because I have to have a pound of this and two half-pounds of that in a couple days is a pain, and sucks the joy right out of it. I'd recommend against doing hobbies for pay unless your enjoyment is VERY resilient against deadlines.

Though, if you're curious, you can still see the "friends and family order page" I put up with my stock at the time here: http://sehrgut.co.uk/coffee/ .