Ok.
I will think again.
Let me write what I have considered:
1. Card feels 10,000+GST=11, 800
2. I am planning to convert 40,000 welcome rewards into 10,000 Rs Amazon voucher. So card cost me 11800-10000= 1800 rs from my pocket.
3. I live in tire 3 city so monthly 4 tickets of 250 rs will be more than sufficient.
So by paying 1800 rs, I can have 4 movie tickets per month for a year.
Am I missing something?