I have like four pages of Disasters in my inventory. If I had LMBd them, they'd be in three pages.
And cost me 600k more Gems.
Spending Gems for the sake of spending Gems isn't worth it. Until I manage to amass over 2m stockpile, I'm not wasting any Gems. Currently, as a EU player, I'm pretty much hovering +-0 Gems income a week. This includes events, as I can't do enough of Gem Quests.