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Showing the ads is not a bad idea. If the amount of steem you give away is slightly less than the ad payout that can help pay for the hosting, steem node, etc. I don't know if this is the case or not, and I am not saying it is a negative. If it works out that way then that is a good idea and you and the visitors both benefit.

I have to run a seed node anyways to be taken seriously as a witness, this is just a fun project built ontop of it to help spread STEEM. Eventually I'll sit down and crunch the numbers to see how much I can give away a day in order to break even but for now it's simply a matter of giving away free STEEM to those who want it. :)