Actual the huge quantities kitsh can be quite valuable, but just not right away. What makes the valuable is they're sole goal it to be pleasing to it's contraries, but not particularly preserved. this means the huge numbers have a half life and become illustrative of an age at a later period. Your grandkids or great grandkids can actual see an increased value your to mass produced kitch if it's still in good nick then.
Where as "collector items" on the other hand often don't have lasting value ones the fad bubble burst.