Mortal Kombat 1 players aren't happy about the high price of DLC in the premium store and the lack of information about whether items can be earned in the Shrine or if they're exclusively DLC.
One post on the subreddit from Redditor Jiggsteruno calls the premium store "predatory" and points out that some skins in the premium store actually costs more than a whole character does in the Kombat Pack, and that it's a huge increase from Mortal Kombat 11, which sold some of its skins in packs of 3 for around $6, working out to $2 per character. Add to that the fact that these skins are in rotation and not always available, and it's easy to see why the sentiment is echoed in other posts on the subreddit, like this one from Doomerator.
Another big issue that players have with the store is that it doesn't give any indication as to whether something you buy there can actually be earned somewhere else in the game. Case in point, the Indiana Jones Johnny Cage skin, which can actually be randomly obtained in the Shrine, yet is being offered up as DLC.
This was theorised to be the case last week when some players discovered that Dark Sindel, who was one of the items on offer in the store, was also in the Shrine, leaving some feeling burned about buying something that could be unlocked without any warning of such. Some players on the subreddit are calling for a tag to be added to these items so that anyone buying knows that they can unlock it in the Shrine with enough patience and luck, but it's not clear if this is something NetherRealm plans on adding.