I think the fundamental problem with that the events keep coming and they offer no explanation on the process. I understand that they may not be allowed to by contract as forums moderators, but I for one would still love for them to say even that.
The majority of the community just wants to know why the cost of ninjas like Iruka, Ningendo, and Sailor Sakura keep going up from event to event. Also why the events seem to, as a whole, be pushing towards spending more and more money for less and less while the community responds negatively.
Oasis Games would have made WAY more money this week if they gave us better rates, synergy in events (Top Up rewards combined with ingot spending rewards in general.). If they gave us coupons back or even a discount for top ups their sales numbers would fly.
On the Free to Play side, you can easily encourage coupons spenders to spend and even top up just by offering better rewards and rates. The fishing event shows what not to do, same with a majority of the recent coupon events.