One thing that helps with the maintenance of Lexus vehicles is that, unlike with some other luxury brands, Some of the work (and minor repairs) can be done for less money, at Toyota dealerships. In most instances, you get the same filters, plugs, wiring, fluids, brake pads, wiper blades, etc......, at both Toyota and Lexus shops. It's just that Toyota shops tend to charge less for the same work. I found that to be the case with my Lexus IS300. When I got the IS, the Service Manager at the local Toyota ship where I had gotten my former Celica and my mom's Corolla said bring the IS there for anything except warranty-related work (he and I were personal friends besides the business aspect, and he often asked my advice after a review). He said, at that time (early 2000s), that warranty work could only be reimbursed at an actual Lexus shop....but that may or may not have changed in the meantime.
And, from what understand, I'm wasn't the only one...a number of Lexus owners also use Toyota shops, for at least the simpler things.
Though I don't have the hard numbers or personal experience to prove it, I would imagine that Lincolns are also probably inexpensive (by luxury-car standards) to maintain, since they are generally sold and serviced at Ford shops....Lincoln no longer has exclusive dealerships of their own in the American market. Some Audi functions might (?) also be able to be done at VW shops.....especially where they share the same engines/drivetrains.