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> You can sell old high karma accounts for quite a lot of money, because those are best for such things.

Why is the accounts karma important for something like that? Does the Reddit algorithm favor high karma accounts when deciding what posts to rank higher?

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Just speculating, but if you create a new account and then spam some positive reviews people will notice and downvote / get you banned from the sub-reddit. If you have some built up history it looks more legit to the other community members.

I'm guessing here, but a lot of subreddits have a minimum karma requirement to make posts or comments (it's a decent anti-spam measure, but easily gamed by low effort bots reposting content every month or so, pretty high chance a lot of people won't have seen it before).

And as with other social media companies, the company behind it is fine with it; bot engagement and bot content is still content, people still watch it, upvote it, and ads and other things are still sold.

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