If you don't go and take a peek from across Khyber pass, then someone else will come and screw you for hundreds of years.
When you rely on suppliers too much, then you keep buying and selling to Arab traders, and don't develop naval capabilities. Again a tiny country from other side of the world will send a force on your shores and you will be screwed for 100s of years.
When do you intend to learn a lesson?
You may be living in the la-la land where relying on US infrastructure for a small fee looks like a great idea, but you would do well to consider what if Obama decides he doesn't like Indian anymore. Americans sent a warship in Bay of Bengal in 1971 in support of Pakistan. If you leech onto their GPS then it is not hard to imagine that you will have to seek their permission before tackling any troublemaker in the region. You may not have a problem with this setup, but many others do.
Now to see what happens to the countries that don't go beyond their coasts, look at the allocations of arctic or antarctic regions. Do you want the smallest share of the pie when moon is being mined?
And then there is China. Have you spoken to someone who can recollect what fear people lived in 1960s. In my opinion both space and nuclear program of India are not a luxury, they are necessary tools to tackle existential threats. And both of these programs have run very cost effectively with good results.
However, if you feel particularly philanthropic, then nobody stops you from being the messiah. Mother Teresa didn't come on HN to change the world. Go do what you pretend to believe in..