If you think your time is worth something, burning wood probably doesnt pay off. I charge $35 per hour for myself while I am working so the 2-3 hours per load of wood that lasts me about 1 week would translate into about $350 a month in labor. Plus I hae come up with an approximation of about $9 per truckload in costs. (gas, saws, chains, etc) Add it all up and I am looking at about $386 a month to burn wood IF I COUNT MY TIME....
I can heat my house with propane for quite a bit less than that. I myself though do not count my time on a saturday or sunday. What else am I doing. Drinking beer? Might as well cut some wood. If I was taking time from work to cut then I'd just buy propane.