Somewhat amusingly, here are a couple of GameFAQs (http://www.gamefaqs.com/boards/559823-mechassault/50992657) threads (http://www.gamefaqs.com/boards/559823-mechassault/53430343) from 2009 with people complaining that the DLC for that MechAssault Xbox game cost more than the game itself could be bought at the time. And another thread (http://www.gamefaqs.com/boards/559823-mechassault/62901402) with someone asking where's the DLC, so not only is this game probably the first to have paid DLC, it's probably one of the first to have access to its DLC lost due to arbitrary bullshit like the shutting down of servers and such (though apparently it's still obtainable through unofficial channels).