since i got my 01 M5 last March, i've gotten about a half dozen surveys in the mail; however, don't think it's because of my M5 because prior to that i bought a 540i in june 99, and a M3 in sep 97 and i've been getting about 6 surveys a year since 1997.
my thinking is at first i got the frequent surveys because my name got on some "just bought new car list". now, obviously, i keep getting them because my name is on some "this guy fills out and returns surveys pretty regularly list".
i like the ones that include a nice, crisp new dollar bill though
marketing genius because even though i know exactly what it's supposed to do, it still works on me because i take the dollar and feel guilt tripped into filling out the forms. a couple were surveys which sent the mailer asking you to sit in on an auto industry or auto design poll; those were pretty cool to go to. one paid something like $200 for each volunteer for about 4 hours of time. they actually sounded like they wanted our input and opinions about current auto design and what our worst complaints were.
man, i can not WAIT until the next invite comes in the mail. i'm going to talk their ears off about the new 7 design from BMW.