I didn't get the idea from this post that the author was recommending buying a luxury car, only that you should look for steeper discounts on used luxury cars.
You're right, though: Euro import cars in particular cost significantly more to maintain; you can safely expect to spend 50% more per year on them (I say, ruefully).
If you're going to purchase an expensive import, be sure to look around for good independent mechanics.
I drive a Saab, and several months ago it experienced a fairly common failure related to the cabin blower motors. The dealership wanted to replace with all new dealer parts from Sweden, and provided a ~$1400 estimate.
My independent mechanic, who tells me he deals with this particular issue on a near weekly basis, told me that the part I needed was identical to a part found in earlier Cadillac Cateras. Just by using that part, he was able to fix my car for $680 -- over 50% savings.
Maintenance by the dealer can often be significantly more expensive, and there's almost always a competent independent shop nearby that specializes in your car.
I had this same issue last year. I bought a replacement fan for around $200-250 online and just did the job myself. It was kind of an awkward repair since you have to squeeze into the cabin and work on your back, but I did it with a ratcheting driver, torx bit, and extension in about 2 hours.
Online Saab communities are awesome and common problems usually have step-by-step instructions from others who have done the repairs, most even have pictures.
I've had pretty good luck with my Saab. It's on '04 with 140k miles and that blower fan has been my most expensive unexpected repair.
I acquired a copy of Saab's WIS. You should as well, especially if you do your own repairs & maintenance. It's insanely helpful. You can acquire it via the typical channels.
My '03 NG 9-3 has been a joy so far. I just need the parts freeze to thaw out a bit so I can get a replacement key made, because I've only got the one and am terrified of losing it.
I always like to pass on hard-learned lessons about cars. After I bought the $750 spark plug wire kit, I decided to save money by doing the job myself.
It turned out that spacing between the plug wires and the climate control blower motor was critical -- I'd didn't pack the wire tightly enough, and my $750 wires broke the $950 + $400 labor blower motor. :(
You're right, though: Euro import cars in particular cost significantly more to maintain; you can safely expect to spend 50% more per year on them (I say, ruefully).