Wow, thought I was bad..!
I have mostly only recent brochures. Whenever I go to car shows (Sydney Motor Show next week?) I collect heaps! Then I find I never really use them.. but it's the fun of collecting and sitting in cars

Every now and then I do throw out the old ones, though. I suppose I don't find the nostalgia or reference value that great after a while. I mainly use brochures for comparison purposes.
I usually only get brochures for cars that I'm considering to buy, or for a reasonable comparison, even if it's onyl vaguely considering. The most expensive cars I have with brochures are probably like A6/E-class and stuff. I guess I'm not that keen to ask at Motor Shows for expensive cars, and also for mailed brochures, even. I'm only 25 and I get the idea they wouldn't take me seriously.