You can't compare a entry level RTR to show that nitro is cheaper/better.
CRAPS was clearly talking about racing... and only a complete newb races a box stock RTR. And even at that... a Losi/AE RTR is more than $300... and you still have to buy several gallons of fuel and some plugs, and a good ignitor and rx pack/charger to get through a summer of racing.
Losi XXXNT $350
rx pack $20
6 cell pack for starter $20
dynamite charger for all above $40
4 gallons fuel and 4 plugs $130
total for a RTR newbie setup: $580
This does of course include a radio.... but it's not exactly what you see as a typical racer setup either.
Let's do apples to apples against the RTR XXXNT:
Losi XXXT Brushless RTR $370
8000mah lipo pack $80
Integy AC/DC 6.5A lipo charger $100
total for RTR newbie setup: $550
The 4300 on lipo will be pretty fast.... maybe not ballistic like a 5.5.. but I bet money that it could hang with the XXXNT on the track, easily........
So.... even with RTR... brushless is cheaper
I have nitro also... but I don't inhale the fumes like some....