Gold Treasure Chest - way to stealing your RP-s

Just one more story about stealing RP's, this way through 

GOLD TREASURE CHEST

 by using GOLD TREASURE CHEST KEY

I've had 72 RP when popup jumps out:
TREASURE CHEST

Chance to win 1,000 Reward Points!

Unlock this Gold Treasure Chest using one of your Keys.

So I press option UNLOCK (Uses 1 Key)

 Surprise!!!!
Another popup with the same message,
only
I've noticed that instead of 72 RP now i have 63, and chance to lose another 9 if I press Unlock (Uses 1 Key) again.

Zynga could you please remove this Gold Treasure Chest/Key option from the game,

or find the way

 not to steal my RP-s through it.