Personally I think that part of the problem is that, afew years ago, a 10th TC chassis would set you back the best part of £200ish...and an 8th rallycross kit would probably be around £280; Now you're look at around £350ish for a TC and way over that for a nitro.
I think the appeal of RC is also to do with the whole customisation; being able to slap the ESC you want in, the servos you want in etc...I cant see how a budget class would appeal to the masses.
To get back into 10th TC nowadays, and feel like I had a small chance of doing reletively well you'r talking HUGE bux after youve spent your £300 on a chassis, £200 on an ESC/motor, plus warmers, tyres, LiPo's etc.
Shame really. Its things like the B4, at only £180(?) for a FT kit that keep things abit more realisic if you're able to race offroad locally.
Long live cheap 2WD racing