I had a dealer like that too. The only car he used somewhat frequently was his girlfriends mercedes, but other than that it was lincolns, acuras, BMWs, and audis.
he has his "non-dealing" cars, which are his bmws, mercedes, infinitis and caddys. and then he has his "dealing" cars which are buicks, lincolns and i think an impala. he said he never likes to deal in a luxury car, which i guess makes sense. idk i can't keep them straight, i always have to ask what he'll be in when i call him. wish i had that cash $$$