My 2 cents
What
don't you count when you calculate the word count.
Front matter(copyright, books by author...)? Teasers for other books? Pages of 'Rave reviews'? Sample chapters? Glossary? Dramatis Persona?

I am trying to think of all the other stuff I frequently see other than the Story (Forward through Epilogue)
I guess I never worry about word count.
When I get to 'The End', I am done