It's easy for you to say that you've bought all those apps, but then, you can afford them but with others, they can't and thus are forced to pirate stuff.
They aren't forced to pirate anything. We aren't talking about basic things they absolutely need, not for their lives nor even to use their phone.
Most things on Google Play are free, ad supported or freemium, and those that are not you can certainly live without. Whether they think that it's not a problem since they just couldn't buy them anyway and hence there's no lost sale is a different issue, but at least when it comes to apps for their smartphone there's certainly nothing forcing them to pirate.