Stamps don't bother me at all.
Stamps are like banknotes.
The Collectable Shows I attend have both coins and stamps so they seem natural together. Local shops here do carry both products. Like coin collecting, Stamp collecting has declined in popularity. I saw my Dealer offered stamp collections for sale and he often declines buying them or sellers giving them up on the very first offer. He makes most of his business in buying & selling bullion now.