An excessive number of trading sites implies greater liquidity yet less volume since its partitioned on numerous exchangers like in binance, bitrex and etc.  I can see a few coins which has exceptionally huge volume however in other trade less another disservice of having many trade is its progressively inclined to hacking a few trades doesn't satisfy the security guideline which watch out for misfortune numerous coins in many brokers, No one is not against having a lot of trades today but rather the security must be tight in each stage.