And there lies death
True and Office (I think I can still call it that, right, not MS Office?) believed (in so far as a group of individuals can believe) that the break point was 90%. If only 10% of users need (maybe 'want' these days) it (split infinitive, bloody hell, I can split anything) then if you try to provide it you will die.
Office, evidently, is still alive. I think it actually did 99%, but based on the comments on this thread it was apparently 101%.
Free stuff whacks out at 50%, like you suggested.