Maybe because there is deposit & withdrawal delays (Confirmation time needed) for all their listed currencies + manually approve withdrawals.

CredenceCoin Volume on coinexchange.io is drastically low too as per the following:

#   Source   Pair   Volume (24h)   Price   Volume (%)   Updated
1    Mercatox   CRDNC/BTC    $471,908    $4.37    65.20%    Recently
2    Mercatox   CRDNC/ETH    $226,273    $4.31    31.26%    Recently
3    CoinExchange   CRDNC/BTC    $25,597    $3.88    3.54%    Recently