There is no other way to get gate passes....the best is to make a tank noblessed and win many matches...almost all tanks have like 100 points even if they are far from the score the first has...so u can get some enchant scrolls or bogs

you don't need to become hero to get passes.
you can exchange your nobless points once you've more tha 50, it means that you have to win only 1 match in olympiade.
once you've won, you can exchange your points and buy some items.

some "nobles also pay good to be feeded (give your nobless points to them by loosing your match against them)

I think its 40 points in oly