[psandman]

you can't play NL or PLO without table stakes rule. If you do then players are going to be able to essentially cheat.

I put $1000 in my pocket. If you make a big bet at me on the river that I want to call with only the chips left on the table I say I am all in. But if I like my hand enough to put $1000 more in I reach into my pocket and call your bet.

And no knowing how much other players have is a ridiculous way to play NL or PL.

You don't need a cap, but all the money should be on the table (or at least every player should have to declare how much is in their pockets before they begin).