I think there are just not many cars. Club racing and IT need ITB and ITC. Costs are perceived to be much lower than ITR and ITS and now the resurgent and expanding ITA. You can spend big bucks on any car but a top ITC and ITB car can be bought for south of $7500, easy. There needs to be a place newbie perceive to be 'entry level' in terms of $$$ I think.
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This is the problem, as of today there are very few newer cars that fit into B and C. But that is today, if gas hits north of $3 a gallon we may see new small sporty cars again with some small engines. I am not holding my breath, but it would be nice.