It is trivial for moderators to check whether someone is banned or not. I just have to take a look at their profile.
But a real pain in the butt for us.
I'm very well aware of that.
I would suggest a Rank: "Banned". One word, right under the username. It can even be a warning for other people.
Excellent.
This may actually be a good idea. I'll check with theymos to see what he thinks.
I was particularly wondering if us members would have ways of detecting sold accounts.
My example way seems good. Any other ways?
That example is really an obvious one if you look at the second page of last posts. I'm not aware of other methods, maybe someone else has a suggestion or two.