Ever notice that the trade between the developing world and the industrial nations tends to go up after a nuclear test. This has been the case with China and this has been the case with India. Nuclear weapons are abviously necessary for defense reasons but they are equally necessary for business reasons. Nuclear weapons are great leverage point from which to attract more business.
Industrial nations are so concerned about political stability the world over that they will do what ever it takes to appease the countries with a nuclear porgram. For India, this means increased investment till the day when India gives up its nuclear program. This is like a unending catch 22 in favor of India.