Displaying a count on the Snooze folder is contradictory to the purpose of a Snooze folder.

1) The purpose of snoozing an email is so that it clears (currently) unnecessary clutter from the interface and from the mind. The count however is constantly reminding use of stuff we want to (temporarily) forget.

2) The purpose of a count is to make sure we don't overlook a mail. This is achieved with a snoozed email by it reappearing in the inbox - there's no need for a second mechanism.

Fwiw, personally I think most folders should have counts (e.g., spam and drafts) because they prevent things being overlooked. But Snooze is an exception because it is purpose is to allow something to be overlooked for a period.