Re: can anyone make a living with this hobby?
Make a living? It's problematic.
Offset costs of a hobby, sure but get serious about making a living and legal and liability issues are gonna rear their heads quickly.
Check your states' moped laws for one thing, most say under 50cc and 2 bhp.
Then, if we are talking about china kits, there is the huge reliability issue.
A $100 department store bike and a china kit might be fun for the backyard guy who likes to tinker
and whose expectations are low but would be a nighmare to supply to the general public who just wants to ride as the bike and kit starts to fall apart in the first season.