I'm a buy a frame and fork, equip to perfectly match my tastes, replace things as they wear out sort of guy where the bike shops are irrelevant because they don't have what I want (try to find a 1997 Campagnolo Record seatpost in 2015. Not 1994 and older with an aero design I can't insert far enough. Not 1995-1996 with a vertical logo that'd be half inside my frame. Not 1998 with a different mechanism having one degree level increments where one is too low and one too high. Not a nice looking Nitto post which should be functionally identical but won't stay put unless tightened with a torque wrench to 16 nm). I'm still riding the frame and fork I bought in 1997 because they fit and ride as nice as they did back then.

After sale service doesn't matter because it takes more time to get a bike to a shop than it does to do any maintenance short of wheel building where the time might be close to a wash with two round trips for drop-off and pickup plus you're more likely to do a good job (most LBS mechanics don't build enough wheels to do a good job fast enough for their employer to make a decent hourly markup on their labor, and compromise by doing a speedy shoddy job. You can take how ever much time and beer it takes to get it right without that pressure).

If you want to sponsor local advocacy and clubs, donate what you'd pay a shop for its markup over on-line parts sources instead of letting a shop pay them some small unspecified fraction.

You don't need to replace tubes unless you get a flat and prefer not to patch at which point a shop isn't going to help you without getting a ride there.

Lubricating a chain and wiping off the outside takes a few minutes every few hundred miles after the initial lubrication disappears too much (that took 1800 miles of dry riding for my current chain).

It may not last as long as if you cleaned it thoroughly, although as a fair weather rider who avoids rain that can still be 3000-5000+ miles depending on your weight and riding style with $20-$30 amortized over that almost free. It will last longer than if you try to clean it but don't get it properly dried out.

If you're unwilling to do that, find a mobile bike mechanic and save yourself travel time to the shop.

Other dirt is primarily cosmetic. Road rear derailleurs not ridden in too much rain and snow take a long time to gunk up enough to need service. My last one went 13 years before I needed to disassemble and clean the upper and lower pivots so it wasn't sluggish about maintaining chain tension (it'd still be fine, although I moved on to 10 cogs which implies a different actuation ratio with Campagnolo). I've never had a front derailleur need cleaning for mechanical reasons

Road bikes actually require very little maintenance - beyond avoiding a squeaky chain it's just replacing worn out tires (usually at least 2500 miles, I get 5000), replacing chains (usually at least 2000, I get 5000 on dry-weather chains), replacing rear shift cables (down from 4500 to 2500 miles), replacing rear shift housing (now 4000 miles), servicing cup-and-cone hubs (at least 3000 miles), adjusting brake toe-in when the pads wear at an angle and start to squeal (7500 miles), replacing bar tape (every few years), replacing hoods (~10,000 miles). I also like to wipe off road grime with a paper towel dampened with mineral spirits so my hands don't get dirty.

Location doesn't matter. Wear items like tubes, tires, and cables are the only things which go bad unexpectedly with any regularity; although it's a question of when they'll be done not if so you can stock up and avoid visits. Other things are likely to be out of stock and it's easier to order online with home delivery than making a trip or two to the shop for them.