For me this hobby is:
- identify the subject I want to replicate
- do as much research as possible on the subject (details, painting etc)
- assembly it to my best (the most enjoyable part)
- place it in the cabinet next to the others.
But there are several people that don't have the time or the skill, but like to collect them and they have the money.
I know a few modelers on an Italian forum that assembly nice aircraft models for money and this practice is also quite frequent among modelers doing figurines.
Alberto