I’ve replied elsewhere in how I reported the support overhead for older browser versions.

While one could fudge numbers once, we could get accustomed to misrepresenting in the future too. Once users/customers discover this, they’ll always keep second-guessing us. Trust once lost would be difficult to regain. It is better to how customers that they need not waste money anymore and shouldn’t support/facilitate users using insecure and outdated technology anymore either. They could give it a positive spin and get good PR too.