Ok, i ask about offline poker, also with short breaks.

In a normal deal where the price structure is changed, its true that all must agree. So to official casino rules.

But what about deals between 2 players only?
Where is the difference to a side bet between the two players only, who will be eliminated first. Couldnt be bets between all people made(spectators, former players), who will win, or be eliminated next?

What if this deal is made in a break, maybe even with the notice of the other player. What about a secret deal, nobody can control?
Is it still a disadvantage for the player who denied 2 deal offers and still got the official price structure?

Are there some real POKER RULES? Or is most of it special tournament rules, so Pokerstars has other rules than other poker rooms, casinos and WSOP.