Pirates wear earrings for many reasons. Here are some possible explanations:

1. Earrings are regarded as lucky amulets among pirates, which can bring good luck and protect them from harm.

2. Earrings can be used as a symbol for pirates to identify themselves and gangs.

Earrings can be used to pay for funeral expenses. If pirates are killed at sea, their earrings can be used to pay for funeral expenses.

Earrings can also be used as jewelry to show the glory and status of pirates.

In a word, pirates wear earrings for a variety of reasons, some of which may be based on superstition and tradition, and some may be based on practical considerations.