Why is "karma farming" discouraged in many communities?

Karma farming refers to the deliberate pursuit of upvotes through methods that prioritize vote accumulation over genuine community contribution. In its milder forms, this means repeatedly reposting content that has already gone viral, copying the top comment from a previous thread and posting it again, or crafting posts designed purely for emotional manipulation — fabricated sob stories, artificial outrage, or content tuned to trigger reflexive upvoting. In its more severe forms, karma farming involves explicit vote solicitation, coordinated upvote exchanges, bot-driven manipulation, and the sale of high-karma accounts. The reason these practices are discouraged is that karma was designed as a reputation signal, not a goal in itself. When karma accurately reflects genuine contribution — helpful answers, original content, thoughtful participation — it serves as a useful indicator of whether an account has been a constructive community member. Subreddits use karma thresholds precisely because they trust that a user with meaningful karma is more likely to engage authentically than an anonymous new account. Karma farming corrupts this signal, producing accounts with high karma that represent no real community investment. The downstream effects are practical as well as philosophical. Subreddits that get flooded with recycled viral content see their discovery of fresh original material suppressed. Communities where fabricated stories spread widely develop a culture of skepticism that makes genuine sharing feel risky. When karma-farmed accounts get sold to spammers or political manipulators, the high karma allows those actors to bypass the exact filters subreddits use to protect themselves. Reddit's own rules treat the most aggressive forms of karma farming as vote manipulation, which is prohibited under the Content Policy. Communities commonly ban users caught karma farming not because they broke a local rule but because the association with karma-farm subreddits signals that the account may be operated by a spammer or bad actor. The reputational stain of karma farming undermines the basic trust mechanisms that make Reddit communities function.