After 90 days of inactivity, I purge "non-active" users if they have less then x amount of posts.
Usually 3.
180 days of inactivity, and they are removed no matter what.
So I usually have 95% active users.
I no longer use email verification. For two reasons, the first is anybody can get an email account in 1 minute, so it won't stop anybody trying to make "troll" accounts, and the 2nd, spam filters block them and they never can get into the site.
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