When people bump a thread, they are hoping to drive the thread up so a more current status. Unfortunately they end up pissing other members off. A lot of members have alerts set on some threads, to let them know if someone has posted new content. All they see is a bunch of bumps or senseless comments like wow, I like, etc..
BUMP, blank posts, or random characters or punctuation designed to bump the thread are pointless and provide no value and is frustrating for active users.