Illustrated looters delight with no player cap. Awesome idea.
Oh, oh, and with not all the players existing on the same level or plane of existance, but all existing in 4 at once; There's 13 levels in a circle (A, 2, 3... 10, J, Q, K, A, 2, 3...), and players will exist on 4 consecutive levels at once. They can see and interact with any players or loot on any of their levels, but not on other levels... even though they exist in the exact same space!
Loot that spawns for a player exists on the same levels as that player; if another player takes it, it might not be able to affect everyone that player sees.
Alex spawns on layers 5-8. He starts with a awesome sports car. Bob spawns on layers 8-J, spawns with a sniper rifle, and shoots Alex. He steals Alex's car, then tries to drive over Carl, who spawned on layers 9-Q. Carl sees Bob floating towards him, and freaks out. Bob sees Carl passing through the hood of the car, and freaks out until he just shoots Carl.
You'll rarely have to worry about players on other levels. However, there are many a object that allows passage between levels, or even separation (Such as moving you from Q-2 to Q, 2, 3,
.
All levels are identical except for the players and loot in them, and what the players do to them.
OK, even if this doesn't become how I'm imagining this, someone has to make a 13 layers of hell arena game.
And yes, the existing in four layers does correspond to having four suits in a deck of cards.