So I did the experiment. I put someone in my Ignore List and asked her to PM me. Results: I was able to PM her, and she received it. I did not receive the PM she sent to me. She found the PM she sent me in her Sent Folder. I mean, it makes sense that we don't get those PMs. To me it's about not having to read some posts, so the PMing part never crossed my mind and doesn't make a difference kuz these members wouldn't PM me. However, this is yet another benefit of the feature if one wanted to avoid PMs.