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To be honest, I'm a bit curious about the "push" column in your site. It already has "*" sign but there is no additional information that explains it at the bottom of the page. Did you forget to add it? After all I finally found whats that column about and IMO its kinda against with your statement aboveQuote
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Instead of calling it as donations, I feel it tends to something like sponsored lists. I'm not saying that you are wrong nor against if you want to gain some money from the site, just you need to make all pieces of information you provide clear as possible if you want to make a sponsored list then you should have your own terms and highlighted them at the top of the table or the site itself. 