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.
The old collectors knew that their collections would lose value if they did not develop successors. That's why the old collectors also went to schools and offered to run stamp collecting clubs for free. But today is a different time.
Low-value and mediocre stamps are losing value. But the exceptionally rare and unique stamps retain their value or, on the contrary, their value increases.