Some bots are acting irresponsibly by selling votes on posts very close to final payout. These votes are sneaky, not promotion and are most of the time placed on low value content.
Well I agree upon this, people use bots just for their profit, getting upvotes. The content of the post doesn't mean anything to them, they post shit and get upvotes, it's simply business, this kinda shit should be avoided here on this platform. People who's content is really awesome don't get that much of upvotes as they don't use bots.