league requirement wont help since it just means you have to spend some more time lvling up your alt.
also more runes available does benefit DoG, because it allows more players thus shorter queue time so better experience for paying players.
I don't have a problem with people farming so much as how it impacts anyone else who just wants to play a normal tournament if they get "stuck" in such a thing.
Limit accounts - you can only get first place and second place reward once. I know they'll just use alts - trouble is, they can always do this, you just have to make it difficult and annoying enough for them until they give up. But yh, ban tournies temporarily (makes me sad, but think it's the only solution).
Looks like farmers are just hateful people whose only defence is personal attacks against respectful players. I have also faced them and don't really want to play tournaments anymore.