Department store bikes.
Yes. I know they suck. They're cheap and badly made. They tend to agglomerate around college neighborhood back porches. They rust. They creak. They go unlubed and unloved.
But, consider this. Not everyone appreciates an expensive bike. They're mainly interested in transportation, and I'd wager that cheap, department store bikes log more miles in this country than carbon fiber crotch rockets. I'd bet that there is FAR more point A to point B getting accomplished by shitty, low-cost bikes with non-functioning front shocks or oddly molded aluminum frames, than by the things that you and I ride.
We are the exception. They are the rule.
And I think they rule.