I won't buy anything that has blatent branding or logos on it because if they want me to be their advertising bill board then they should be giving me the item and paying me each time I go out with it. I even turn carrier bags inside out when I have to use one.
I also won't buy bottled water or anything that has an annoying advert or stupid branding or labeling.
Like in the BMW/Audi example, I won't buy from a shop or outlet that doesn't respect all customers equally. Sometimes I have to pop out to a shop when I am at work and looking a mess.
I also won't buy anything that has any connection to sport, religion or politics.
Apart from being the closest to my spceifications and requirements, one of the reasons I bought my car was that it had dash board vents that closed flush and didn't need a pipe cleaner to dust. Also because it had a little drop down sun visor ahead of the rear view mirror to fill the gap between the two main sun visors.
The other thing about buying a Skoda was that I couldn't justify spending more for the same car but with a VW or Audi badge on it.