How do they make a profit?

Ten days ago I ordered an RJ45 connector, so I could extend ethernet leads if I needed to.

The cost from a dealer on Amazon Marketplace was 60p or around $1 for those over the other side of the pond. With free postage.

Well it arrived today and it works a treat, considering the price.

The amazing thing is it was sent to me air mail from Hong Kong, and it was free.

Now I do wonder how they actually make a profit on a 60p ($1) item sent free half way round the world by air mail?

Answers please either on a postcard or as a comment on this posting.