system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5 region locking on games and DVDs.

I get how it works, I guess I'm just wondering why we have it at all.
gpt
Imagine you have two friends. Bob is very poor, and can only afford to spend one dollar a week. Bert is very rich, and can afford to spend a thousand dollars a week.

RegionLockGames bring out a new game. They could put in on the market for one dollar, and both Bob and Bert would buy it, making them two dollars. Or they could put it on the market for 100 dollars, and Bert alone would buy it - he can afford it but Bob simply can't.

Then they realise that if they sell a version with a big "Only Bob can buy this" on it, they can sell that for a dollar, and Bert has to buy the 100 dollar version, even though they are identical. This way they make more money.