Not trying to cause any problems or anything, but what is the reason to buy these units at this price? Are those interested more getting these for a hobby without concern for if they make back the investment, or am I wrong to think that at these prices, there is no way these will ROI? Just wondering the logic behind it. I was interested in getting one (or a few) but I did the math, and it doesn't make sense. Perhaps my math is wrong. Are these at least in some way profitable? Thanks!