Could put in a plugin to kick inactive users after X time. but 3000 house is 125 DAYS! of 24 hour play time. If you play on a normal bases you can get that in 1-3 years. still not terrible if someone afk for 125 days strait.
And how would you know this? He could've been on the server since 2013, but never made a forums account. Don't just assume, smh. Neutral. I guess this is a good idea, but it's not really necessary. Also, people may have joined in 2013, but never played at all, and might've just come on the server now.