I voted 'both'... The majority of what I do every day is installing kits onto bicycles for people who don't have a lot of money to spend... But even then, there's a lot of extra work that goes into those bikes to make them reliable that people don't think about, like beveling the sides of the rear sprocket, making shims & engine mounts to properly install the engine & customizing the exhaust pipes (that always seem to be in the way of the frame or pedals).
Then you get into the $2000+ bikes... I have to start from a old 1950s frame & build up from there. I have to reweld the fork, relace the wheels with better hubs, build a full custom fitting expansion pipe, disassemble & port the engine... & the list goes on. For some reason, even though I build BTR bikes that look similar, they never bolt together the same way. :/
I'm so busy building regular bikes these days that I don't have any time to build the full custom choppers that I used to... I think I'm going to have to hire someone to help out in the shop pretty soon. Anyone need a part time job?