The last question is beyond my understanding. Most of time, I hack on FOSS because I need some features, which aren't there. Or I need to fix some bugs develope

The last question is beyond my understanding. Most of time, I hack on FOSS because I need some features, which aren't there. Or I need to fix some bugs developers had no time to take care of, but which prevent me from using the software. Sometimes I give patches to upstream, sometimes I decide that I'm too lazy for communication, or that patches aren't worth publishing. I do that for my job (I'm being paid for making things work, and we use lots of FOSS software) and I do that on my own leisure-time too (be it some project, or just toying around). But I really don't see any answer to describe something to describe my "I hack to get this working in a way I want" utilitarian needs. Add: And if I dig deeper, to the reasons why I want it to work, there are too many reasons. Sometimes it's just a part of my job, sometimes I just want to fullfill my interests, sometimes I want to help someone or do something that would matter.