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Check at the stats of yearly patents filled of both the countries you'll get the ans.

Entrepreneurship in India is still fairly new and there just aren't enough innovations happening
The more innovative a country is, the better the work for IP lawyers.

We are a low-innovation country which just specialises in copying.
IP Law is the worst practice area to be in. Repeated mundane clerical, still time taking. Especially patent law. Also, the pay in IP is the least amongst all practice areas. Firm don't want to hire and want you to do clerical work of more than one person can do.