In my case, growing older and moving towards #1. Although, I don’t really have a lot to start with as I only have 10 or so pieces and half of them are Seikos! And yet, it seems a lot to me. Also, sentimentality gets in the way. Having said that, the process of reduction is on going. In fact, I have one that may go to a good friend of mine. If and when it happens, I’ll post it here. Your post is an age old enthusiast question and yet our answers get more nuanced over time.