I found this sentence in the New York Times "Copy Edit" quiz #15:
"Initially, the cost of playing the game was inexpensive."
According to Philip Corbett (the NYT editor who runs the blog column), it is incorrect (according to their style guide) to say "cost is inexpensive". The game can be inexpensive or playing the game can be inexpensive but not the cost. Instead, the writer should have said something like:
Initially, the cost of playing the game was low.
I have googled trying to find a rule on this but so far I haven't found anyone who has noted that something like that is a problem.
What are the thoughts of scholars here? Is it incorrect to use "cost" and "inexpensive" together?