Kinda weird when bittrex want to add it but got no words from the dev.
Maybe because bittrex offer to list BTC/GNT yet still asked for 3 btc for it.
The exchange is known to it although this is just for those coins requesting and wants it listed as soon as possible.
I think Bittrex listing is 5 BTC not 3 BTC.
5btc is the fee for bittrex unwilling to list, if bittrex is interested in it, it cost nothing, like eth, xmr, ltc, doge, they would never ask great projects for listing fee.