‘A trigghia no ‘a mangia cu’ ‘a pigghia

Traduzione e/o significato
Whoever catches it doesn't eat the red mullet.
It alludes to the fact that the red mullet, being a delicious and expensive fish, in the past was not consumed by those who caught it because they preferred to sell it.
In general, this applies to all luxury goods which are often not affordable for those who produce them.