Well, if you wanna argue it, the Cubs were the first "sell outs" in an age when there was no such thing. Wrigley used to be Cubs Park or Cubs Field or the like. Wrigley bought it out in the 40s I think. However, it's not quite the same as the other teams and parks in that the Wrigley's own the Cubs, they didn't just pay to have their name on the park like most do. What I hate most about this corporate naming scheme is that it can change so easily. In San Francisco alone, the Giants played for years at Candlestick Park which became 3-COM park after naming rights were sold. Then, a couple years later, the Giants moved into a new ballpark named PacBell (after Pacific Bell phone company), but even this has since been renamed to something else I can't quite recall at the moment. This is all in the span of about six years.