Well, maybe I was just spoiled by the books, but I certainly got the impression of Predators that, whilst they didn't mind an advantage, it still had to be a challenge to the point that simply walking out of a bush, strolling up to someone and killing them was not an option. I'd say armour strong enough to withstand 6 grandes is not exactly 'sporting'
As Kosh pointed out, humans often highly outclass the creatures you hunt, but then, I've never really considered using nightscopes, camoflauge and a high-velocity rifle for hunting rabbits as a sport that carries much risk as such, but then, the Predators are not humans, they seem to need far more actual physical risk in their hunt.
A Caste system
was mentioned in the books iirc, and that would also explain that mentality to a degree, caste systems, obviously, lean towards different skills depending on the caste, and that specialisation can lead to a search for perfection, sometimes to almost self-destructive levels. Take Spartans from ancient Greece as a good example of what happens when a caste becomes extremely specialised, Spartan warriors were some of the greatest in history, but they were also famous for being confident to the point of arrogance, famously, unwilling to withdraw from any fight, and yet, would also dislike having to fight a foe that was grossly inferior, believing there was no honour in a battle that could not be lost. Spartan initiation rituals were pretty brutal in nature, not all would-be warriors survived it, and that, to the Spartans, was how things should be, the weak would fall.
