So if a game launches with DRM it's forever tainted and that group of people who supposedly would have bought the game absent DRM won't buy it - even if the DRM is subsequently removed. But on the flip side, if a game doesn't launch with DRM then it's pirated immediately and there's no way to measure the sales in the period pre and post-crack, because there effectively is no pre-crack period.

You've constructed an unfalsifiable claim here.