Before one of Bungie’s update, I was able to use my other character to buy masterwork cores starting at 10 shards. So I’d buy 3 cores @70 shards with my warlock, then buy 3 cores @70 shards with my Titan. Once they dropped the update, my other character will see the cost of purchasing a core starting at 80 shards. I don’t get why Bungie punishes players with multiple characters.