For some, there is an element of nostalgia in using the older processes. The extreme are those who shoot reenactors with wet-plate Collodion ( I honestly can not understand why one would wish to relive the Civil War). A far better reason is that Alternative Processes were short-circuited by silver-gelatin. Their potential was never fully explored. Tintypes, for example, produce some of the best portrait images I've ever seen; and I hope to try the process in near future. Its appeal to me has nothing to do with nostalgia. The images are often timeless with a beauty not matched by other methods.