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Right now the bot has approx 116k SP. If you delegate 10k SP, you will receive 8.6% of all PALcoin it receives every day for upvotes. That amount will vary by the amount being sent, but it will always be split according to how much you have thrown in the hat so-to-speak.

There isnt any way to know, it all depends on how much people send for bids. we might have a better idea of an average in a few weeks or a month maybe