and of course you will also have less expense
just my 2 satoshis
This seems to always be a point of contention between collectors. The premium on these sorts of coins honestly doesn't seem worth the risk to me currently, but some of them still do fetch decent premiums. The thought of losing such value in the mail is heartbreaking to me, but I'll admit I've shipped some pretty insane things. I guess it comes down to risk and the individual, but it's no easy decision to sell instead of peel. If you bought a Casascius coin for $10 a long time ago, you might be more than happy with peeling, but I could see someone who is at a loss in USD terms wanting to try and get back as much as they can. Timing could also have a lot to do with it. Imagine missing the top of a market because you wanted to negotiate a sale. These Casascius coins are selling for around $30K now even with the premium, so a buyer peeling when BTC was over $60K instead of waiting for the right sale arguably made the right decision.
TL;DR - A bird in the hand...