I got banned from a big towny server for discussing the server's hardware with the staff. The server had some i7s but it still had big lag spikes due to custom coded plugins. I suggested they upgrade to Xeon processors.
Two seconds later, I was banned permanently for "Inappropriate Behavior". WHAT?! That's way too vague! That reason can apply to anything!
Also, in one of my earlier towns, someone else made an AFK well (a stream of water that pushes you in a circle while you're AFK) which was not allowed since it apparently could be used to AFK farm a job. One day someone removed the water from the well and, not knowing that they were not allowed, replaced the water thinking someone griefed it. Fast forward to the day I got banned, the mods ran LogBlock on the well, saw that I had placed the water, and immediately assumed that I built the whole thing. So that didn't help.
I like towny, but god the mods on that server are corrupt.