Any hobby could be similarly impugned. Seems a bit perverse to pick on the poor philatelist, when you equally well have chosen the numismatist, or the whatever·ya·call·him·who·does·matchboxes, or a friend of mine, distinguished folklorist of the urban myth, who used to collect soft-drink cans — or the folkie, for that matter. Frankly, I consider you to have arbitrarily & unacceptably & hyperbolically & erroneously overdefined the term — taxonomically.