Of course they pay a little bit, what I'm saying is they make good deals, otherwise they wouldn't take the contract. That's why we see them returning to the same arenas so often, because that's where they'll get good deals... What it may have to do with is people wouldn't be coming out to the arena on a Friday in NA, since you can't just take a day off like in for example Sweden... Basically, with another arena day, price goes up, and ticket sales won't go up enough for it to be a worthy investment.
Also, everyone would know who they would face in the semi. So for example if you start the day at 10am playing a quarter, you know who you'd be playing afterwards, if you win. Therefore a good thing could be to have Friday as a break day, to give all the teams time to prepare.
Let's say Faze plays a quarter final at 10AM and win it. They would then go on to playing a semi final at 4pm, not so much time in between, but with this format, they would've known the semi opponent since earlier so the only thing they'd have to do is pretty much rest and take some fresh air in between the games. Still though, 3 arena days is the best.