Oh, yeah, he's obsessed with them, but I don't think that really comes through in the show. Mainly because I watch car shows and know how nuts car guys can come off and what he's putting on the show is car guy light. Have you seen Jay Leno's Garage?
As far as the show being an excuse to show off his cars, only two of the cars on the show so far have been his. And a scooter, but I don't think that counts.
What I get from the show is not a guy obsessed with cars, which he is, but a guy obsessed with comedy. I've watched each season multiple times and the way he and his guests speak about the topic of comedy, the passion that comes through, is what brings this show alive. The cars are really an afterthought.