You mean the little mini-fridge that keeps my Grey Poupon at just the right temperature could be draining my battery? Do tell! :D
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I ended up going back to Motorcraft batteries. The NAPA legend batteries kept failing. And DuraJunk and NeverStart batteries failed more than any other battery at the shops I worked at. The Motorcraft have a 3yr free replacement, and 100 month warranty. You can buy them at O'Reilly Auto.
My truck has never started better in the cold with any other battery.
I put Duracell AGM batteries from Sams in my Duramax and they have been great. All my Jeeps have Sears Diehard Platinums.
Finally replaced the battery in our truck, after 5 years. It was in there when we purchased it. It has power do dads AND sits most of the year. Sees light use except for 1-2 weeks end of summer. I understand what you're saying with these $$ rides. Their sound systems have back up sound systems to power the amps.
Crap, I just bought an Audi last week.
Manual says it starts turning off systems after sitting for a while so that the battery does not completely run dead, but I guess I'll see.
It's now my daily driver, so hopefully it will last a while.
My '04 Tahoe had all kinds of electric doo-dads, including seat, mirror, and pedal positions for 2 drivers. After 11 years it was only putting out 160 CCA, but it never let me down and always started. I'm not sure that proves anything.