It can be interpretered that the rarer a thing is, the more it is worth.If the thing has an excessive quantity, it will become valueless.So you cook too much,the flavour will be unfavorable.

• 用高深的词语来解释，便是物以稀为贵，东西多了，就不那么值钱了，所以菜炒多了，味道就那么不值钱了。