XXL is on an exchange!
It's on Comkort, which is actually runs a fantastic service - great design, seamless functionality and brilliant customer service. I know you're specifically referring to an XXL active exchange, but Comkort has all the ingredients to be just that. Check it out, I'm sure you'll agree...
https://comkort.com/market/trade/xxl_btc
Also on Allcrypt
https://www.allcrypt.com/market?id=302
https://www.allcrypt.com/market?id=304
https://www.allcrypt.com/market?id=303
BTC market is too difficult to sell because people put up sell walls of 1 billion at 1 satoshi so you'd have to wait an eternity to sell your XXLcoin at that price. It's better to use the LTC and DOGE markets. That's how I bought my XXLcoin really cheap, on the XXL/DOGE market.