I love collecting memoribilia and cards. With photos it's easier to find pieces that "fit" together. Card used imagery being the easiest but most expensive (and not always that interesting). Finding that perfect paring of an action shot like the Miņoso below with an aging sepia tone is great. It complements the yellow of his 1952 and they fit seamlessly together, that is part of what gets me going and collecting photos.
It's all about storytelling for my collection not really about completing anything so thats why I lean more towards memoribilia. In weird way, it's almost backwards. A card shows a whole seasons worth of stats and career numbers but photos, tickets and programs more or less show singular moments or games. For me though, the latter brings you closer to the game where as cards I feel held at a distance.
I'd be lying if I didn't think certain pieces of my collection aren't decent stores of value (see below my orginal photo of Satchel by Jacobellis and accompanying Retirado). I try to use my funds on big names that will always have people interested in them but I also love picking up pieces of guys like Don Newcombe and Dan Bankhead (seen below greating fans in the Dominican Republic during the 1948).