I agree that expanding the prizes beyond the top three would incentivize people a bit more.
Full disclosure: I won my KOTH group. That said my group seemed to be more even than most as I “only” had a 12% advantage over the second and third best teams in my group. Still I had close to a 30% advantage over the weakest members. All in all it meant I had 3 to 4 close to clear wins. Still I liked the event last year when I did not come close to winning the group and this year when I did win. I'd love if as the final prize you were offered three different players, of different positions, and were allowed to choose like in the previous International games.
But really I have small complaints. I have not played my new striker yet but I'm happy to have him.