Because it's 95 cents. Even with the author offering it, going through the process of requesting, accepting, and entering the code is effort to save 95 cents. It's 95 cents.
Yes but it's more interesting than just spending 95 cents. That's also the reason why I still pirate stuff - the process itself is fun.
The average developer salary in India is $7,725. That is 14 times less than the $110.140 in the US. 14$ value might be seen as too much to try some small game.