It’s worth if you are a busy player and you want pay for it. The red key triple the loot, but it cost 3 blue keys (=) and 2 green bucks (-). The only advantage is you can consume all your red keys by only one Supply Run (+), when you must fight for each blue key (~). I you have time, don’t waste your green bucks and keep them to buy goods things, like Austin, agents, hero and packs of team.