Venom is right. I race nitro tourers and absolutely love them. Im just sick of the costs involved to be competetive and to maintain a 'raceable' car! With high end motors, Rods, pistons, sleeves, etc have got to be changed pretty regularly and set you back anywhere between $120-$300 in Australia and if you want to race, you have no choice. I think this is the main contributing factor.
I also think that the popularity of electric tourers is also growing as x nitro guys see it as a somewhat cheaper alternative. Although the set-up costs are high, running costs are cheaper!
P.S. im a semi-convert