Then include the cost of T1 and T2 in your calculation then; unless you think people are doing Con Spam into IS2s.
T1 or T2 is free with your starting fuel. But even if you add in the 50 fuel the IS2 still costs markedly less than the KT, this ofc doesn't account for OKW's fuel income reduction, so with the 33% reduction in income your paying the equivalent of 494 fuel.