Unlike historical advertising pieces (display cases, grooved boards, old ink bottles, posters) that are rare and collector-worthy, on current giveaway and promotion articles it is rather about irrational enthusiast prices: Coca-Cola collectors behave similarly, as do lovers of old fountain pens. Collectors advise dealers not to throw away old advertising materials, since for nearly anything a buyer is found. Critically seen are excessive prices for anyway freely available current brochures (e.g. Kafka), since one gets them free in specialist trade. With own exhibitions, celluloid-containing vintage writing instruments should be stored light-protected; modern devices may by contrast lie without problems in lit display cases.