* pafu -> Being a Member, started off with a 500 Merit airdrop instead of 10 (could be a bought account, but I thought there were no demotions..). -> https://bitcointalk.org/index.php?action=profile;u=25731

If you delete the posts that gave you activity points, you will lose them. Pafu has posted this in the Portuguese local board (my language):

Puts, perdi o rank de Hero Member porque apaguei meus posts Shocked

Which translates to: "Shit, I lost my Hero Member rank because I deleted my posts".

Thanks for the insight. It seemed something rather weird, and now we know we can demoted ourselves by going easy on post deletion.