"but it has the opposite effect." - so you think the reduction of engine/power units usage from 2 to 3 per race to 3 per season had an opposite cost effect? Or limitation of tire sets that could be used over a race weekend had an opposite cost effect?
Or do you want to remove the regulations and have only 4 or 6 cars (Mercedes, Ferrari and possible McLaren) racing for 21 races instead of 20 to 22 cars for the same amount of races every season?