Are you counting just bans or also warnings? Both are displayed on the mod history, but if you're counting the warnings then I think it's hardly justified to say you should've got permabanned.
There are people who got permabanned with less than 20 or even 10 entries. 52 entries while not even being close to permaban seems like a feat to me. I'm only at 34 and I'm already at 7 day ban legths.
If you demand respect or gratitude for your volunteer work, you're doing volunteering wrong.