I always thought that the gas tourer class was the entry point for most people into nitro onroad racing. If rear exhaust engines are allowed then the average Joe/Joette that wants to start racing will walk into their local hobby shop and ask what they need to be competitive and the answer will be:
Chassis $600 - $750 MTX4 V1rrr etc
Motor $200 - $300
Batt, Fuel etc $50
Starter Box and Batt $150
Radio $200+
Servos $200 2xaverage digital servos
Total: $1400+
Thats enough to scare everybody out of the hobby. If you keep the class so that cars like the FW05, VoneS, RTR NTC3, HPI Nitro's etc are competitive it makes the class more accessable to newbs and consequently bring in more entries and money for the clubs.