why do you think traders will use crowd connect to display their trading activities when they can have their own page. Also, since you will be asking for a fee, isn't that bias? They can just show their positive trades and will not display their negative trades.
The trading signals will be posted on their own page. CrowdConnect is to be used to advertise their group to a large userbase that is interested just in their trades. The groups will have the option whether to post their trades or not, but the ones who do will look more trusted to those who are interested. The reviews will be entirely based upon users who have been in the group. The point of having the payment being CrowdConnect Coin is to allow a holders reward for based upon the small fee of having their group posted, much less than that of regular ads.
Groups will be getting the benefit of advertising to a large database in extra for a very small fee from transactions.