The Tibetan leadership is incapable of doing any good to anyone at all. They are concerned about their own interest, their money and their power. The Tibetans including the Dalai Lama are only their tools to use to achieve their personal agenda.
Not only the Tibetan leadership wants its people to remain as refugees, but they also manipulate them to sacrifice their own lives so they can use the self-immolation cases to further condemn China. Lobsang Sangay always uses these self-immolation cases to ask for more money from the west. They encourage the Tibetans to self-immolate by glorifying the act.
Most of the self-immolation cases are in China mainly because the Tibetans in Tibet are more gullible, they don't know what is happening outside of Tibet. Thus, they can be easily manipulated. The other reason is that the Tibetan leadership is using self-immolation cases to create havoc in China.