Costco 100 % silk short sleeve shirts,,,the buttons ALWAYS FALL OFF

I like the comfort/feel of these cheap ,about $20, all silk shirts,,,but you would think by now,,,Sept.2009, someone at Costco would notice,,,that the buttons fall off right away ,before the first wash !! I must own 10 different ones; The yellow, the red, and the blue are my favorite. But every time i buy a new color, i have to sewing-rip tool the label off the sensitive neck, and sew all the front buttons on all over again.