Which has been done already. A panther costs as much as an IS2. The AAHT is almost twice more expensive than the M5AA. The PIV is more expensive than the Ez8 yet it is much worse. etc
OKW is already paying 310 fuel for a king tiger, 200 for a panther, 100 for a stuka and 65 for a luchs. If that ain't high then I don't know....
I know, I wasn't suggesting to make it higher.
The OP was asking for a return to resource penalty, which I think this way is better with the inflated prices doing the same thing.
However, some of their abilities are incredibly underpriced, as they only inflated the cost of some vehicles fuel. Muni abilities need to be inflated too.