I suspect that good eyepieces are kept for longer that you have a scope.
But...that said. I also suspect that after a few scopes you settle on one that may not suit your eyepieces.
For example my TV plossl range are great for my C8 but...not so good a my ED80 due to magnification, eye relief etc.
On that note...there is no way I'd part with them...unless I purchased naglers!