I actually cannot stand usernames with that sparkle image, or any kind of sparkles. 😛 I love sparkles don't get me wrong but it looks tackier than username icons IMO.
Nope, because they're not very appealing. Not to mention they're pretty distracting. I wouldn't ever enable them as they make everything else look bad on the forum. 😛
These always look unprofessional in my opinion. A colored username should be enough to distinguish staff. effects on the username, icons, and backgrounds are too much I think, unless it's a customer support forum where staff need to stand out especially.