Peoples are so infused with the jahilya/innate materialism of the West that they quantify everything in economic terms : they have basically in a way absorbed the liberal/Marxist epistemology. In the West liberalism/Marxism at least were going in pair with crass materialism, scientific rationalism, expanding industrialism and expansive colonialism, but our own have just taken the worst of the package, without the few good points.
If you have this liberal/Marxist vision of history, you can't explain anything from Islam, from why a "bunch of Bedouins" united and defeated the two superpowers of their days - the Romans and Persians -, and why the same Arabs, who were seen as peripheral barbarians by the peoples who first mentioned them (the Assyrians, around 800 BC), in just a century had a bigger empire than Rome at its apex, under emperor Hadrian, at the beginning of the second century CE. Historians, anthropologists, sociologists, ... still wonder how all of that happened - it's the same for the '79 Islamic revolution in Iran, no one was expected the Shah to be ousted, certainly not the Carter administration - in a summer of (forced) secularization in the Islamic/Arab worlds, it was unexpected that a revolution rises in the name of religion and tradition.
Like it's not in our tradition to put our parents into nursing homes when they're "too old" (understand from a capitalist pov : not malleable into the labor force), the same who nurtured when we were ourselves "too young" (not economically active), even if Pakistan and/or Kashmir were THE worst of the worst in terms of economies, that shouldn't change our religious/ethnocultural bound.
You can't measure your soul on a balance, even less trade it, and it's the same here - our relationship with Kashmir can't be quantified in economic terms.
Many Kashmiris want to be part of the only modern State founded in the name of Islam, which in other terms means that its politics/cultural dynamics/social morals/... will always follow the Islamic praxis and norms, as a State (even if individuals can ofc diverge) - that alone is an argument.