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ALL of the Dominion games that are being played are practice games.
Because they don't have the internal matchmaking set up, they all need to be practice games. The way practice games are set up, they automatically give you a -50% exp penalty.
So to anyone complaining about things like "39 IP for 25 min game! QQ" just double it. Not to mention the added bonus for having a real game (I believe it's what, +18 on SR? could be similar on Dominion) and you get quite a bit of IP for a short game.