The prices you quoted for coffee roasting machihnes were for the roasting machine assembly only. If you start using a 5 kilo machine in your garage in a suburban area, and the neighbours WILL complain when you fill the area with acrid black smoke from the roasting process, the EPA and various other bodies will land on your doorstep and advise you to either, STOP conducting commercial operations in a non industrial area OR, tell you to fit an afterburner to clean up the smoke hazard. The afterburner may cost as much as the roaster or if not, a signficant percentage of the original price of the roaster. Take note of Jeff's advice....there is a lot more to running a coffee roasting business, than the act of "Coffee Roasting" per se, and this is what most people forget OR dont realise when they are thinking on going into it.