This is probably due to trying to prevent inserting html into the wall comments.
the mods have shot down the rep system every single time it was suggested. I still vote no on it if I have any actual say. We already have enough fanboy wars, we don't need 1 more.
FWIW, I agree. A reputation system in a place like this just wouldn't end well. I think the console tags are pretty much the same deal though.