My guess is that they won't be performing experiments with paying users, for two reasons: 1. Paying users are too valuable. 2. Free users can "opt out" of exp

My guess is that they won't be performing experiments with paying users, for two reasons: 1. Paying users are too valuable. 2. Free users can "opt out" of experiments by paying - and they'll get some nice features for "free" as they do so. (Edit, formatting)