Bob,
The dumping point relates specifically to the Sheedi community of Makran. Other Sheedi communities have different traditions and history. For example, the princely state of Janjira near Mumbai was ruled by Sheedi nawabs.
The banning of the slave trade by the British destroyed the economies of Oman, Qatar and states of the UAE, as this was main source of income.
What you also have to accept is that Sheedi are one of the most marganalized group in India and Pakistan.