Your Thingiverse only has two over year old designs? How serious are you?
Yea, I am net positive with my 3d printing, that includes buying another printer. You have to remember that the raw material the 3d printers use is relatively cheap. I can print off something that costs me less than $1 per part, not including labor, electricity, etc, and still charge multiple times what it cost me to make. #d printing is basically a money making machine if you find the right niche and are decent at design.