I've been a fairly serious cyclist since the seventies. At 62, my knees are getting a little wonky, so maybe that's one reason to build an MB....
I'm in "campus" law enforcement, and do bike patrol as well as maintaining our department's fleet of 20+ patrol bikes.
I also repair/refurbish bikes and re-sell 'em; I've made about 600 bucks this season. Currently finishing up a Raleigh "technium" roadster.
My main ride is a vintage (1972) Cilo/Swiss roadster I've extensively upgraded; a very smooth ride with it's butted-steel Columbus frame.
I also built a recumbent, but it needs a bit more work.