Message board banning - Does it serve a valuable purpose?

[fbd]

on a public message board like oa.com, you need banning. spammers can come, or people show up to start trouble. a ban or two, and they go away. here, i cant see why anybody should be banned(theres what...3 people?). the cell works just as good, and can entertain us. people who would normally be banned cant come here, so it works out the same in the end