You know what would have been a really, really, awesome idea for Inno to try out?
What if say, the 2nd most expensive 'chest' was something like:
20% Daily Special
5% Lv1 Magic Residence
5% Lv1 Magic Workshop
15% Combining Catalyst
55% 10kp Instant
Overall, not a 'great' way to earn lots of stuff, but the tiny % chance for even a base Lv1 magical buildings would def grab people's attention!
And even *if* one gets lucky enough to grab a magic building or three over the course of the event, they're still just Lv1's and will need eventually 14 or 15+ bp's/RR spells to fully upgrade!
FoE does similar types of 'premium' themed chests in their events, and a goodly number of casual players will take them, as the lure of diamond-only buildings is strong...
Overall though, it's a 'bad' way to aim for any kind of 'grand prize/s' due to the overall poor event currency/chest ratio vs. most of the other chest options.
Here in elvenar, where it's a helluva lot harder to horde diamonds in general, it could be a good money-maker for Inno?!