@kuza55 ...why have a quiz... they should know what they can post by looking in the trash can to see what not to post... if they dont read the rules... then i hope they dont expect any mercy from us... 
For the same reason you perform culling or moderation, because some people don't bother finding forums rules and reading them, and its easier for you to write a small add-on (or I can do it if you don't want to waste time on it) than to have to deal with stupid posts, continuously. Sure some stupid people will post something that is obviously against forums rules anyway, but then they have no excuse whatsoever (even though ignorance isn't a ghood excuse), just cull them there instead of giving warnings.
The idea was that you only have to deal with the stubbornly stupid rather than just the ignorant....*shrug*, its your time, if you're fine with the way it is I'm not going to try and convince you otherwise.
our hard core members are pretty sick to death with the same lame requests all the time... only fair to them we make an effort to improve our forum for them...by us having a cull every so often...a lot rejoin when we open again... we hope they learned a lesson the first time their accounts are deleted...many have and are still here 