Although my experience level is 50+ I'm slowly learning about Steem as i go. Yes, that 25% curation is unfair and now I just realised we profit little using those bid-bots.
It's also quite unfair when new users get to upvote with ≤0.001 and it means a post could have 100+ upvotes but barely any reward!
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The system is really complex, and even people that are here since the start still learn new things everyday. The curation is, for me, fair, as it rewards you for upvoting other people posts (hence reading, interacting, finding good content, etc.). In the case of the bid-bots it's different, as they profit from this curation system without bringing the "good things" (interactions, as they're are automated bot paid for voting) that are expected from this system.
And yes for the little upvotes, that's unfair as Steem is 100% based on stake (your Steem Power, hence your wealth) and they should be other criterias taken into account (interaction for example, engagement in the community, etc.).