It just depends on how quickly eBays search index is happening. It's not something controlled by Auctiva. Basically it should be the same for any eBay seller. Sometimes eBay is just slower than other times at getting search updated.
When you block a person, they can no longer invite you to a private message or post to your profile wall. Replies and comments they make will be collapsed/hidden by default. Finally, you'll never receive email notifications about content they create or likes they designate for your content.
Note: if you proceed, you will no longer be following .