Times have changed in the gaming world, and the integration of internet capabilities has allowed developers to produce content for their games well after the initial release date. Downloadable content has proven to be a successful means of giving players more, though it did have a rough start; do I even need to mention Horse Armor? There is always the issue of iffy pricing, but many of the downloadable games, maps, and expansions are too good to pass up.
That said, have you purchased any DLC for the 360? If so, where do you draw the line, if you do at all?