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What is the benefit of voting there? Does it affect anything, or is it just a crypto popularity contest thing?

If it is a popularity contest, that will help make STEEM more valuable.

@valth and @imerick This is a trading market sites where I'm promoting this site dab for voting steem not only present in poloniex and bittrex but can also be present in mercatox.. I did not take the popularity of here but I only helps to promote.