Pointless collection, Getting 1-2 rulers +18 is already worth more than all your weapons together and at least they are usefull and won't be obsolete when a new tier releases (unlike your upgs). Not selling upgrades doesn't balance the game. I could get more upgrades than you have but it's plain useless to invest ecash in them, I invested my Ecash in more useful and more economical stable pixels(lololol). Don't care who owns how many upgrades it's a dumb achievement lol.