As a mod, I don't always click on the lovely mod
button when I visit a site, and this sometimes allows spam to sit around longer than I would like.
On SO, Gaming, and other big sites, it isn't so much a problem because enough users will hit the flag
button to get rid of it, but on many of the new, especially beta sites, spam may sit for a while before being flagged six times (we're already addressing the user training issue).
Please light up the Mod Light on beta sites!