explain why form caching isnt effective

booking.regn_form.inc

@@ -951,12 +951,17 @@ function booking_form($node, &$form_state, $inserting = FALSE, $early_access_all
     );
   }
 
+  // https://www.lullabot.com/articles/a-beginners-guide-to-caching-data-in-drupal-7
+  // This code will only cache this one element
+  // And forms get cached differently anyway
+  /*
   $form['cache'] = array('#cache' => array(
       'cid' => 'booking_data',
       'bin' => 'cache_booking',
       'expire' => time() + 360,
     ),
   );
+  */
 
   if ($inserting == TRUE) {
     $form['submit'] = array(