~snip~
Being a host will give them the chance to be in the world cup playing against the teams but in fact when the team is not ready for the world cup and they are not really qualified normally they will just lose all the games and leave the World cup fast, just like what happened to Qatar and it doesn't matter how much money they spend for the world cup.
Absolutely.
That's what you get as a host, you get to start playing in the world cup.
After that, you're treated the same as the rest.
The thing is that historically the world cup has been hosted in countries that are good at the game, Qatar was an exception.
Qatar is an exception, that itself confirms that something have have happened behind the light. If the host is Brazil, Argentina, Italy, Spain or some other country where football is celebrated then it would serve as a disappointment when the host team exits earlier. For a country like Qatar leaving the world cup earlier isn't a big thing. What they looked is grab the attention and improve the economy.