There&#x27;s a minimal karma level required to get the flag button.<p>There&#x27;s a somewhat higher (500? 750?) karma level to get the downvote button.<p>There&#x27;s a karma level to get the ability to change the top bar colour.<p>I&#x27;m not sure if karma is used to place comments on a page - someone with high average karma may find their comments appearing higher on a page (and then rising or falling based on votes on that comment).<p>Other than that, nothing.