Does Polo have a volume requirement to list a coin?
Yeah, poloniex lists most active in trading, but they require very innovative features to be there. Not easy to be there.
But see, here is my thought though, there are a couple of coins that appear to be either/or/and (scamcoins, low trading volume, worthless, dead) such as (IMHO)... PinkCoin, Huntercoin, Siacoin. How did they get listed on Polo? The only coin with low value both in price and trading volume is Dogecoin, because it's Doge and no one can hate Doge.