I think what Vanan is saying, is that there's a difference between those who keep their hobby as a hobby and lose cash, and those whose hobby starts to pay for other things, like projection sets. Bottom line has little meaning for straight hobbyists, while for others, there needs to be a bottom line.
Main Entry: 2hobby
Inflected Form(s): plural hobbies
Etymology: short for hobbyhorse
: a pursuit outside one's regular occupation engaged in especially for relaxation
- hob·by·ist /-bE-ist/ noun