I'm sure the intent wasn't to grind that for keys -- the keys are probably a drop chance. People just chose to grind it because despite how much they complain, they can't understand the game isn't meant to be ground like that. It's like the people who would delete their characters and re level for a new lockout, or play the same class three times and get bored of the class. You chose to do it. Yeah, I wish this game had less competitive content among other much needed improvements, but repeating a public cheat event for the off chance of more keys is not worth my time. I'll grind some things, but not those locations for hours.