While I do believe that there are some favorable, positive factors that really help the CTS entry counts such as the amount of influence the direct Factory's involvement and Factory Team attendance brings their series, Mr. Vera brings some valid points to light. Though the CTS does have two slower classes, F1 and USGT, maybe limiting our own series (whatever that may turnout to be), to just 2 touring classes only, 17.5 and mod may possibly help growth or if nothing else at least increase the difficulty level in each class to make the A-Main.
Grow the 2 primary classes first, then branch off into other classes if, and only if, there is REAL support for additional classes.