It's too bad he didn't hold on to those Fish Police and Samurai sets.
Don't look back. You should never look back.
I recall a 1988 conversation where a customer wanted to put a book away to give his newborn son on his 21st birthday. At the time, all these books were close in price- GS X-Men 1, FF 48, GI Joe 2 and Nexus #1. I was pushing the first two while he liked the second ones. I believe he ended up with the GI Joe.
I sold my AF 15 in 1981 for $200. I'd paid $115 for it a few months earlier and was quite happy with my profit.. I've never regretted it.