CMS Widget Caching, still running query on every refresh

[findingpeace]

I've created a PHP Direct Execution CMS Widget with this code to count the number of donating members:

global $vbulletin;

$cmember = $vbulletin->db->query_read_slave("SELECT count(*) as num
FROM " . TABLE_PREFIX . "user AS user
WHERE user.usergroupid IN (9) OR FIND_IN_SET(9, membergroupids)");

$cmembers= $vbulletin->db->fetch_array($cmember);

$content = array('cmembers' => $cmembers[num]); 

vB_Template::preRegister('vbcms_widget_mywidget',$content);

Works great, except I set a 5 minute refresh cache, but every time I load the CMS, the debugger shows this query being run:

SELECT count(*) as num
FROM vbuser AS user
WHERE user.usergroupid IN (9) OR FIND_IN_SET(9, membergroupids)

Shouldn't this query only be running every 5 minutes? Right now, it's running on every single refresh, even just seconds later.

Thanks!

--------------- Added [DATE]1408560000[/DATE] at [TIME]1408560000[/TIME] ---------------

This was my own stupid fault. I just pasted in the plugin code, didn't actually set the variable to $output, which the widget instructions told me to do

Basically changed to this:

global $vbulletin;

$cmember = $vbulletin->db->query_read_slave("SELECT count(*) as num
FROM " . TABLE_PREFIX . "user AS user
WHERE user.usergroupid IN (9) OR FIND_IN_SET(9, membergroupids)");

$cmembers= $vbulletin->db->fetch_array($cmember);

$output = array('cmembers' => $cmembers[num]); 

vB_Template::preRegister('vbcms_widget_mywidget',$output);