Of course we all hate box events because of the randomness involved, so if they were dropped completely, I don't think anyone would shed a tear, lol.
But of the different kinds of box events, collect 10, Leaderboard and collect 25, the collect 25 is by far the best. I've seen peeps gem openings for the Haste prizes, who never gemmed boxes before. Especially when the prize was an Alliance boost. Not so much now with the Beast attack boost.
If you want to see gems fly, make the haste prize:
1). +5% Health regen (not the nearly worthless +Health)
2). +1 Energy (not the nearly worthless +5% Energy)
3). Lockbox cooldown. Not as helpful as 1 or 2, but useful.