Megaposters of films, advertisements, and TV shows may be worth hundreds of dollars to private collectors. Part of the appeal of megaposters is their size. However, gathering and storing big posters for investment purposes requires planning, equipment, and lots of storage space. During the 1990s, fans throughout the greater Los Angeles area regularly ripped off bus stop kiosks to steal megaposters.Given the difficulties associated with megaposter preservation, it's no surprise that mint condition posters routinely fetch high prices at auctions. Even posters that aren't particularly rare or historically interesting get priced in the hundreds. Factors that influence the valuation of megaposters include rarity, popularity, condition, completeness of sets, and any unique stories associated with collection.For instance, a megaposter saved from a building fire or autographed by a film or TV star may command much a higher market price than an otherwise unadorned or unremarkable poster. Artwork also determines value. Really captivating images, rich colors, and striking verbal gimmicks make pieces valuable.In an effort to stop people from stealing posters from malls, bus stops, and kiosks, some ad agencies now imprint megaposters with dyes or electronic devices, which automatically ruin stolen posters. If you're in the collector's market, make sure to authenticate any rarity before you purchase. It may behoove you to contact poster production companies directly to see if they have extras or promotional giveaways.