The question is how strong your love for the site has to become to outshine your refusal to view the ads .
You can support the forum and the site indirectly by encouraging its use among other players, therefore increasing traffic and views of the ads, even though it’s not your eyeballs seeing them. Talk about it in-game, if you see new players asking about things, direct them to the wiki or the trading pages. Maybe create some things via the #community-hub:player-events and advertise them in-game. Etc.
There could be simple reasons why they’ve (RealmEye) maintained a non-donation approach after the launch, could even be whatever they’ve agreed as terms of operation with Deca, presuming they have such a thing, actually bars them from accepting direct money. Or not. It could be just for their own principled reasons. Or maybe, like whoever it was at Deca that said it one time, they are actually doing okay for money already.