In my mind button collections belong in two groups, those of us that really don't want to throw them away because "I really might need one", or I can use it for this or that.
Then there are the really dedicated collectors of vintage buttons that were made centurys ago or made from wood or bone or especially ivory, which is now illegal. There are beautiful handmade buttons and blown glass ones. There are still hand made buttons that are very expensive and found in bridal departments. Beautiful.