@mithran has a point, however, look a bit deeper. Lets looks at what Nephilim said:
Compare that to
So 10,000 keys is about 3 LT.
Look at the Gems - I think that is a lower than average but maybe they nerfed the gem payout as well.
GOLD KEYS give you enough gems in 10,000 pulls to buy more than 3 LT pulls worth of event and gem keys!