I think this touches on an important aspect of microtransactions that to my knowledge remains largely unexamined (but maybe I'm just not reading the right critics). Specifically, games are traditionally built as tools that players use to have fun. From house rules in tabletop games to Game Genie/Action Replay to Automatic Mario rom hacks to Minecraft texture packs, players changing games is something that's been part of gaming culture for a long time. When publishers turn a game into a marketing venue for microtransactions, however, they're essentially laying claim to that entire space, turning it into a dictated, manufactured product rather than a self-directed process in the player community.