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I think some people are spending like 50! I just stick to 1 for now. I seem to get less than a 1:1 return though, just from the bots. Once the bot's fee is taken out I usually have paid a little more than I got directly from the bot. But I think the return is coming from the extra attractiveness to humans looking at the post in the new list.

yup, you win some you lose some, it's hard to tell what people will like