I don't believe we exclude email invalid leads from that count - however, I'm in Support not Sales so I don't know all of the details on that. I've been told that we *do* exclude anonymous leads.
As for the unsubscribed leads, even if you delete them from your database, their email addresses remain marked as unsubscribed on the back end via our "durable unsubscribe" feature:
which will automatically unsubscribe a new lead if it has the same email address as a lead which was unsubscribed when it was deleted. So if you have no intent of using those leads again, it's safe to just delete them.
I hope that helps!
You might find this helpful
Unsubscribed leads are added to a back end table that permanently stops a lead from being emailed even if you remove them fromyour instance. If they come back in, they will be unsubscribed until they opt in.
There are threads that explain what marketo charges for. I believe they do not charge for invalid emails only. You can still use an unsubscribed lead, but you might want to keep it in your CRM instead.
Awesome. Very helpful! Thank you both.