The higher the CPC, the higher the competition from the advertisers would be(demand-supply logic). And the higher the demand is, the more people would try to rank in on the top of the keywords and the higher competition for page 1 of the keyword. So, it's not impossible to rank on high CPC keywords but you just need to take basic measures like ensuring it's not too high and analyze what kind of sites are ranking on the top positions for now and plan accordingly on what all you can do to overtake all of them.