<p>Meta.StackOverflow is a little different - it's run as a separate site because it's the meta for the whole StackExchange network in addition to SO, and also for some historical reasons.  On the other site metas, the account is a sort of subaccount of the main account, which is, for example, why you don't accrue reputation for upvotes on Meta.CV.</p>

<p>The <a href="http://blog.stackoverflow.com/2010/07/new-per-site-metas/">blog post</a> introducing the per-site metas goes into some detail on the subject.</p>

<p>EDIT:</p>

<p>And incorporating Aarthi's comment, which I did not know, on the users page of the per-site child metas, users are listed by their activity, not their reputation.  Which makes sense, as otherwise the users page would just be a replica of the main site page, and not very useful.</p>
