It's not specifically for 1st or 3rd party games. I'll be completely honest and say: it's because of trust. Trust that they will deliver great content. They have built a rapport with the PS1, PS2, and PS3, that as long as they keep it up, I'll probably get a PS5, PS6, PS7, etc. as well. Every PlayStation has hit all gaming tastes, from both 1st party and 3rd. So, I guess you could say, the "main reason" I own a PS console....is because it's a PS console. And that's not brand loyalty speaking. That's knowing what that name carries with it: the best games.