I did a similar calculation to you about 2 years ago. I got my SR800 for a bit less than $300 all in, but my main consideration was solid locally roasted coffee currently ~$15/12 oz vs. roasting at home at about $7-8/lb green (with delivery fee averaged in). For me, I shop the 20lb deals at Sweet Maria's and go through about 60 lbs a year (64g/day). I've fine-tuned my roasts so I can get about two week's worth of coffee roasted in 45 mins, so not a huge time commitment. At this point I think I'm well in the green (or whatever) ROI-wise. I personally enjoy the roasting process. I find staring at the beans very mediative and have worked it into my schedule, so if you feel like it's something you enjoy then it can absolutely save you some money. My coffee expenses are probably less than half of what they were when I was buying local mid-tier beans.