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If you wanted a round number you could round the post proceeds up to the nearest 10 maybe XD

Or maybe a totally voluntary entry donation of 1sbd/steem? (totally voluntary for people who want to help spread the love and some especially new steemates may not have built up to that yet)

10-20 is heaps considering it's a showcase :D

Would asking for a voluntary donation work do you think? This would go in the prize pot naturally.

People do it for some of the other games/comps that are running around the place so I'm sure some will. One way to find out ;D

Good point :)

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