new tires, alignment marks

From this post, 5th and 6th pics down ( http://www.forabodiesonly.com/mopar/showthread.php?t=31269 )

Those little yellow circles? When I worked at a motorcycle shop years ago those were supposed to be lined up with the valve stem (pre-balanced tires usually performance tires) am I nuts or do the guys at the car tire places not know what they are for? or do they mean something different on car tires? In the 3 years I worked there I only had to add balance weights to one tire when using the alignment marks and that was a spoked wheel with a tube.