Article says 'world trade in live camels'.

I assume it's mostly meat but have read elsewhere Australia camels are often used for breeding vigour.

On the training. I know more about horses. Where I live in Australia a typical untrained horse will go for about $2-4k and trained it will go from $3k to $10k. Obviously add zeros for special breeds or quality genetics. I cant see camels being too different in ratio of untrained to trained value, even a lower ratio given cheaper labour costs in ME.