I've only been playing and paying, far more then probably should, for a month and a half and that's been ample time to realize they quality of life improvements this game needs that it feels like you are brushing off are not "minor" changes.
Auto battle - more and usable in more places, i.e. dungeons, faction crypts, etc. I know which stage is the max my team can handle at there current strength. So nothing makes me less inclined to give you more money then being forced to stare at the screen while my team auto's the fight so I can click the replay button. This is especially annoying since the # of autobattles allowed even with a subscription is less than the number I could use. If they remain campaign only they should be unlimited, since the lack of energy and desire to do other tings will limit there use anyways. If you want to limit the number of uses then they should be useable in dungeons, faction crypts, etc, since the limited number of them will force people to stare at the screen waiting for the "replay" button, probably cursing the name Plarium the whole while instead of the limit being lack of places to use them:-p
Character Inventory - By far the most lacking feature in the game and the one most desperately in need of fixing.
First - 100 character limit is too small, especially now with faction crypts (5 of each faction required), pvp, 12 man pvp, etc being added and new factions being released. At the very least consider adding 5-10 new slots as each new faction is rolled out.
Second - sort by faction is nice, but why are Dwarves mixed with Knight Revenant's when sorting? Are the two factions dating?
I mean that makes sense considering how few female dwarves there are in game right now.
Third - Why do sorts ONLY work in the main character list and not in Champion Vault as well? Since you don't give us enough room in our main character display and we will routinely want to swap factions in and out for faction crypts why can't we sort by faction to make this so much easier?
Filtering - Next up after fixing sorts should be filtering. i.e. let us filter by faction, which would go a long way towards mitigating the 100 character limit by allowing us to swap factions in and out of vault for faction battles much easier.
Character selling - No, not to other players, but to a mercenary hall in exchange for tokens used to hire characters you actually want, presumably at a ridiculous exchange rate so the incentive is still there to mortgage your house to buy sacred shards, but it would be a nice way to get rid of extra toons we don't want and eventually get something we do want. Tokens would be by rarity, i.e. you can only get legendary with legendary tokens, etc. (This system is used by a Star Wars based Character Collection game and I'm shamelessly stealing the idea from them)
Before you blow that last bit off, let me tell you a story. As I mentioned I've probably spent more in the last 6 weeks then I should have, including a couple of sacred shard packs. You know what I got for that $200? Absolutely nothing! The Legendary characters, maybe 2 I think, are characters I don't care about or want. The epics were doubles (skill upgrades at least) and a new dark elf. The only legendary I got I care about was from a free sacred shard. Moral of the story - never buy sacred shards from your store because they are worthless. Now, if I could trade the characters I don't want from them, even at a 10 to 1 ratio they might be worth something.