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It is betting. Right now randowhale1 has 74% voting power. If you get the average 3% vote that will be worth $2.91.

i see. thought it was more. but at least receiving these upvotes help your articles to get seen by more people in the website. or this is not true??

Yes, that is correct. You have a better chance of entering the HOT category for your tags and maybe even the general HOT tab.