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World cup is a big market for sportsbook makers if you add some promotions into it, it can attract more players to play on the site. One strategy to get the bonus from this promotion might be placing bets on teams that you (or most people) think that is the dominant team like if it's in NBA, place a bet on the USA (which is one of the most dominant team in history) in each of their matches.
On any sportbook then these events are the ones that they should really be putting much attention.Yes, of course where promotions should be add up and they are trying to give out the best possible where gamblers
could see that it is really something interesting or beneficial for them.It is really just normal for a business to consider it out specially if it do focuses out on sports betting.
They wont really be able to sustain the business for long if they wouldnt really be having this kind of consideration.
Speaking about betting on using up your balance or free bets then it wouldnt matter.