The amount of money that is earned by everyone via World Cup is crazy. The hosts make money, Fifa makes a lot of money, the hotels around it makes money, the events around it make money, the shops around it makes money, players make more money due to endorsements as well, hell even clubs make more money because their players worth more if they play well, and even go as far as say that national teams that are not the host make money by selling their jersey as well, that merch income is not something small.
So, overall if we look at every single cent earned thanks to world cup, it is a 11 maybe 12 digit amount, I bet 30-40 billion at least when you calculate it all, and that's not easy to do that is a huge amount of money we are talking about, unheard of in anything else in the world.
Fifa only cares about the money they make though, the rest of it doesn't really matter to them. The tickets will be sold even before the world cup starts, I do not remember a single game, and I mean even if it's two of the worst teams in the world cup, there is not a single game where people buy tickets easily.
There are a lot of people who end up with tickets waaay before world cup starts, and a lot of games tickets are sold out months ahead, you think the final game will be bought right at the gate? We all know that will be already there even before the cup starts. So all in all ticket sales and TV rights and all that goes to Fifa and as long as that's profitable, they will be willing to do it in any nation all around the world, don't care about nothing but the money.