That is only because coinmarketcap.com get it's statistics from coinsmarkets.com, and coinsmarkets.com is down because it couldn't handle the 9mil$ daily volume.
ECA is being traded normally on coinhouse.eu with daily volume of 500k $, which is not that bad... The current price is 60 satoshi, and this shows that there is still good demand for the coin.
So if you consider this price with all the thing you have mentioned... no whitepaper, what happens when max supply is reached,... if the project continues to be developed, the price could be significantly higher
If the coin were scam, it would be dead months ago.
And devs promised whitepaper in Q1/2018... so we shouldn't wair for too long to see...
EDIT:And just as I finished wriging my post, I see that ECA is listed on yobit... good work!
www.yobit.net/en/trade/ECA/BTCWhere did you get the market?