The downside is the posting/comment cost (admittedly low atm), and if you upvote poorly, your trust reduces as does your influence and upvote rewards.
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I tend to upvote comments and content that isn't widely noticed or understood. I don't think this behavior should be discouraged with demerits otherwise it encourages cliqueiness and dog piling and discouragages discussions between individuals that are "paying" each other for their helpfulness.
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That behavior isn't discouraged or punished. You and your discussion counter-party can send each other sats and it has no effect on your trust. If the discussion is in fact niche and no one else appreciates it, you won't get paid rewards, but that's about it.
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newinto a roulette wheel like place to hang out. No real downside to getting it wrong, if in 36h it's all reset.