This is probably a dumb end user question (because I'm a dumb end user).

When I go into my quarantine, I see posts that have been caught by the spam filter. I have the option of marking them black listed. Is there a benefit of doing so? Logically, to me, if the spam filter caught them, the work is done. Why would I want to take the time to mark them as black listed? Looking to be a little bit educated here. Thanks in advance. - Kim