Hello @BrianM88 ,
If you're not sending to them, they won't calculate for an email's open rate, and thus won't affect your overall average. The average open rate is derived from the open rates of your emails. So if you're regularly sending emails to 100 contacts and getting a 75% open rate, then your rate will be higher than someone sending to 1000 contacts at a time with a 30% open rate.
Typically customers will try to keep costs down by getting rid of contacts they don't regularly send to, either deleting or wholly unsubscribing if they want to prevent accidental or synced imports of those same contacts.
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