The collectability of concert memorabilia rests on a number of factors. The historical significance of the show (the first or last performance), what the memorabilia is (equipment, instruments, posters, etc.) and the availability of similar items. Autographed items are more desirable than non-autographed items, and original printed products are better than reproductions.
Clothing and other apparel associated with greats in the music industry can have mixed appeal. The degree of fame or notoriety of the individual in question provides the greatest boost to value. Autographed items are also highly desired. Apparel from certain landmark events, concerts, or recording sessions will generate interest, especially if documents that validate the item accompany it.
Almost any item associated with a movie can attract a collector. The difficulty lies in trying to discover what items will have the greatest following. One way to determine demand is to place the item on an auction site and gauge the response. If the reaction is notable, then the item(s) have an audience and are probably worth collecting. If the response is minimal, collecting it should be abandoned, or hold onto the item and try auctioning it at a later time.
Movie scripts are the most collectable if they contain the revisions of the writer(s) or directors. The script from a well-known film is desirable, but its value is at the lower end of the spectrum. Scripts autographed by the movie’s key personnel enhance its value.
At different times, movie studios purge their prop and wardrobe departments. For the collector, this is a great time to obtain iconic items from movies (Dorothy’s ruby slippers, Harry Potter’s wand). These items are more significant if they are connected to a character, rather than the actor who played the character. Having these items autographed is not recommended, as it will diminish their value. However, having some sort of attribution solidifies the value.
Movie programs are a rarity these days, and fare best with those who collect vintage movie memorabilia. Age alone is not enough. The program must be in mint condition, and be associated with an important movie, actor, director, or film making process. Autographs help increase their value.