It rarely occurs to me to sell. Pretty much one time when my daughter was buying her first house, and I sold a pile of Krugerrands to raise a quick $80K.
My silver is an insurance policy and hedge. I never bought it hoping to make a profit. Now that I could (It's up $25K in the last 18 months since I bought it at $20.98), I don't need it. I do need the insurance policy though. And if it goes to $50, I'm DEFINITELY not selling. That means the bad stuff is here.