In the past I tended to experience more "churn" with my telescopes than with my eyepieces. Although both have slowed down a lot in the last 5 years or so. I have sold a few telescopes in my life but I really haven't sold many eyepieces - only one comes to mind: a Tele Vue 20mm Plössl. I always regretted selling it and I have since bought another one (my "Keeper"!).
My eyepiece collection used to be best described as a "rag tag fugitive fleet" of okulars. In 2016 I actually put some thought into it and built a core "set" that I have been using ever since (TV 20,15,11,8 PL + KK 6 OR). The low power end has changed a bit over the years but for the most part I'm happy with what I have and feel no need to purge.
As for past purging, all my other eyepieces that I've jettisoned have gone either to my 16 yr old son (who has several telescopes now!) or to friends. I do keep a couple of spares kicking around for outreach (not because they are less expensive, but because they have better eye relief and wider fields than my Plössl collection).
I always do try to walk the middle path - keep it simple, keep what I want/need, and enjoy my hobby. I have finally found that balance for me. Everyone has to do what works best for them.