I think you're seriously underestimating how difficult it is to travel twice in the space of 6 days.
I think you're seriously underestimating how difficult it is to sustain that gameplan, both mentally and physically.
Saints had about a 19 week period where it clicked, they bought in, and were pretty much invincible.
I reckon Freo clicked about 10 weeks ago, but teams will come up with something to counteract the GP, you're players will get tired/injured as more is expected of them....and the Saints didn't have to get on a plane so often, nor play on such a big ground as Subi.