This is like saying your CV should be an equivalent of a million dollars which you could literally exchange in a bank for money.

In other words, it would be good to clearly show impact - it would be so useful for the reader to have the final result without having to figure that out himself - but unfortunately it's usually hard enough to find good data for such claims, so anybody actually putting them there is automatically suspicious.

Unless, of course, there's a plausible algorithm for getting such data which I'd like to hear.