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How do we know when to use them is it sorta a gambling

It's basically gambling, yeah. Need to pay close attention to the different bot wallets and make sure there's a good amount of padding in terms of bids. Better to stick to the bigger voting bots I think, less chance of someone putting in a gigantic bid that drags down the ROI. On the small bots (low upvote value) someone can bid 1 SBD and make it unprofitable.