There's a long list of variables that come into play with the market value of a pair or match worn or issued football boots. Which player the boots are from is of course the main variable, the bigger the player the higher the value as they will simply be more desirable for collectors to have in a collection. Modifications have a big effect on the market value, as the more parts that separate a pair from retail versions, the more special and rare it makes them, therefore making them more desirable. The worlds' elite players can customise pretty much anything on their boots such as soleplates, upper materials and so on. The players potential is another factor, if a player is up and coming the value of their boots may even be higher than an already established player in the same position as them. For example, Jadon Sancho's boots have a higher market value than Franck Ribery's.Where the boots are made. This can add just that extra bit of desirability  when looking for a pair of match worn boots. For example, if a Nike pair have been made in the famous Montebelluna factory it makes them just that extra bit special and more desirable.Match worn pairs tend to be worth more than match issued/prepared pairs, mainly due to the fact they are that extra bit more desirable. A worn pair may contain a piece of history from the player they were worn by, such as the player may have scored a certain goal in that pair or they were worn in a particular match/tournament. Whilst match issued/prepared pairs are still specially made for a player and are so different to retail pairs, they just don't carry that same extra bit of X factor that a match worn pair has.