Gaming

For some, $10 is not a sum they can spend on non-essentials. Some don't want to wait for various legitimate reasons. Some want to be able to try the game out before making up their mind on whether they'll pay for it. Some just don't care about giving money to a massive corporation that's definitely not suffering from the lack of money, for one reason or another: one of them, a very prominent one, is to avoid supporting the greedy corporate practices with your wallet, such as the lack of proper optimization and control over the graphical fidelity wrapped up in the "Oh, we just wanna preserve the look for everybody" bullshit.

Lastly, if you really insist on defending paying against piracy, you should know that pirates either never pay in the first place, so it's not like some poor big corp lost some sales, or they're one of the most consistently paying customers for a given media, as has been the case for decades now.

As for whether $10 is a lot... it's really not up to you to decide when someone can or cannot afford to spend their money on. Not to mention that there's no reason to defend a company that has more money than you can imagine, ripping off its employees only because of greed rather than lack of funds, yet they still decide to outsource basically the entire game to a gazillion of other studios, resulting in a game that's kinda good, but very flawed with massive inconsistencies and "play it safe" decisions coupled with good-for-nothing premium editions and confirmed upcoming DLCs only to squeeze more money out of their consumers.