Would you possibly consider the addition of an additional item for purchase? I was thinking like with the VIP monthly purchase, you could have another that, like the VIP second builder, allow you to have one additional battle item for quests, map stages, etc. I am pretty that like the VIP pack, this would be quite popular and a good source of revenue for the company.
One other question that I know has been asked: could you please put in the ability for special offers to purchase different quantities if there is more than 1 item in stock? It’s tedious if there are 5 of a $0.99 item in stock and you want all 5, but have to sit there and make 5 different purchases. For some players (this has mentioned previously by several), their banks have limits on daily, weekly, monthly number of transactions and this could result in additional fees for them which will make them choose between several $0.99 purchases with extra fees or not spending money that would benefit the company. The ability to select different quantities for many different things is already in place: the shop, using loot tickets, etc.
I hope that these ideas are well received and can be implemented. As always, respectful feedback is always welcome.