Wow! another masterpiece blog, full of nice photographs!
As you mentioned above-
The proximity to the sea finally became the fate of the ascetics' community, as pirate raids increasingly took place.
Why pirates raided monks as monks were ascetics? Did they have some wealth?
This place had a single source of water as a well. It depicts the difficult life of monks. They must have been tough people. However, scenery of this place is enchanting.
That is a good question, indeed. I suspect that over the centuries certain assets have been accumulated, for example through donations from the local population and material gifts. Especially in the church itself, valuable clerical objects may have been stored and used for the service. But that's just my guess, I haven't done any more research.