[B00MER]

You could add it to customer/home.php after the require "./featured_products.php"; line.

$total_customers_sql = "SELECT COUNT(xcart_orders.orderid) AS total_orders FROM xcart_orders";
$total_customers = func_query($total_customers_sql);
$smarty->assign("total_customers",$total_customers[0][total_orders]);

Then anywhere in your skin1/*.tpl you can use:

{if $total_customers}{$total_customers} Customers Served.{/if} 

to get the number for results