It's possible for Indian ISPs to buy IPv4 addresses and assign them to customers. Maybe not for $5/month but if you're willing to pay US prices (plus tax) you should be able to get US quality service.
Yes, but they can't do that if every Indian wants one, and they especially can't do that if every Chinese person wants one at the same time.
IPv4 is 32 bits. It has a hard cap of ~4 billion addresses. China and India alone have 2.85 billion people.
Add in the United States and Europe, and now nobody else gets an IP address. South America, Canada, Mexico, Australia, Africa, the middle east, the rest of Southeast Asia, etc. don't get to use the internet. That's 4 billion people who don't get to use the internet.
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