You're not alone buddy. Thanks to a little OCD, I do many things such as that. Here are some: When I sort out weapons if they begin with the same letter, I sort them by the second letter. (Like BA then BB, etc) I always need to have at least 2 Exotic weapons on each slot on my guardian as a backup, 3 for heavy (one for each type). Since year 3, I have the urge to buy new higher light level version of exotics I already have in my Vault from Xur each week even though I don't use them at all.