I'd go with the enthusaist angle as well.

I don't work on our car. Changing wipers is about as mechanical as I get with it, beyond refilling low fluids. It's a beater, there's a leak somewhere in the head that would be more to fix than the car is worth, so lately I've had to swap out the plugs a couple times. But for even easy things like an oil change, it goes to the shop.

I used to be very into motorcycles and did all kinds of work on my bikes. Rejetting carbs, internal fork upgrades, aftermarket parts swaps... all the things people do to their bikes, but on a motorcycle. That lust has faded a bit, but just yesterday, I changed the oil and coolant, oiled the chain and adjusted it, replaced the oil pressure sensor.

I just built a commuter bike from frame up and in the first couple shakedown months, there were a few adjustments here and there. I still need to basically take it apart and build it back up now that I know what works and what doesn't. But really, now that it's pretty much broken in and various things have gone through inital seating and stretching, maintenance is almost non existant. This is an IGH bike with full fenders and canti brakes. Once I get the setup nailed, I expect to have to do very little regular maintenance on it.

We also bought a used tandem... We've been on it 650 mi so far and every week there's something to fix or futz with. I might preemptively replace the brake cables (both shifter cables broke en route at different times). Now that problem areas have been fixed, again maintenance is tailing off... just in time to make various upgrades like a captain stem swap, new stoker bar and stem, eventually a front dynamo hub wheel with lighting...

But I like working on bikes. They are relatively simple compared to a motorcycle, and simpler again than a car. There's a certain pride of being able to do my own work, and if something is done wrong, I have only myself to blame, not some shop I paid.

I think if I wanted to, I could certainly get away with about the same level of maintenance for a bike that I exert for our car or my motorcycle now that I'm not into motos as much as I used to be. But will probably end up putting as much time into the bikes as I used to put into my moto when I was way into them.