Suggestions: scrolls and consumables in general should be under free tier rewards. Paid pass rewards can come less often, but should be way more meaningful, 1st pass was a good one. Cursed Enchant Scroll might come as a 5th card of the page reward, Blessed Enchant Scroll might come as a 10th card of the page reward, something like that. Gloves of Silence might be a final reward, or a Special Armor Ticket.
Some examples/comments about current rewards. Consumables numbers should be reviewed, getting 3 atk scrolls every 10 pages (24k mobs) equals to no reward at all (same applies to most of your premium rewards unfortunately), because they last for 1 hour in total and 24k mobs take way more time than 1 hour for a general single-target class. Getting 2 subjugation crystals... you require to spend 18 of those per 1 attemp for a 15% chance 3-star book, along other materials. Cmon guys, how many passes should 1 complete for a single try on a skill book? I understand you expect ppl to pay, but it should not be an impenetrable pay wall, give them something, some means of acquiring similar things in-game in a reasonable amount of time, not taking billion years vs 5 minutes for "casino players".
If you want more suggestions and feedback in general, you should start participating in the discussions and asking for it explicitly btw, players are not your enemies here. Regards.