I have had three sets of AR3a's and two sets of JBL L100's that I regret selling. I have zero of either now, and wish I had somehow held on to a set of each. I have managed to collect a set of AR6's, AR4x's, AR12's, AR2ax's and several other vintage speakers.
For a while I had tried to set up a vintage system in one room and a more advanced, non-vintage, system in my main listening room. Now both systems are probably more vintage than new. But in wanting more items, I stupidly sold some items I wish I hadn't.