Mods are probably viewed by CA/SEGA as "lost sales", as are second hand game sales. If mods prolong the lifespan of the previous titles (e.g. MTW, RTW and M2TW) then that's a bad thing for CA who obviously want players to move on and buy the newer releases.
Unfortunately there are plenty of people who will pay up for DLC. There is obviously no visible income for CA in modding. Also the Steam platform lends itself best to DLC and multiplayer, which is probably where CA's focus is going to be from now on.
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