Are there REALLY any BAD PRSes? Yet most (but not all) of us have let at least one go.
I for one tend to get emotionally attached to my guitars, but if I really need to de-guitar, I just try to look at the ones "on the block" and see which one offers the least unique features, or with which there is the most overlap with my arsenal (pickup config, frets, etc.)
Then, once I make my decision, I seriously have to put it away in the case, and never open it again. If I open it again prior to the transaction I will second guess the decision, convince myself I cannot live without it, and change my mind. Out of sight...
I'm probably certifiable, but that's what I do.