Just a few days ago Curve Digital released Titan Attacks! on PS4, PS3 and PS Vita, also including cross-buy in the deal, and apparently the game sold a whole lot more on Sony's new console than on the veteran PS3 despite the difference in installed base, as the developer shared on Twitter.

In America we've sold FIVE times more copies of Titan Attacks! on the PS4 than on PS3. What does that say about the future of PS3 digital?

Cross-Buy has been an absolute saviour for us in these cases. Not many people want to buy a game they can't trade on older systems.

Considering how convenient cross-buy is, it would definitely be nice to see more developer and publishers (and not just indies) using the option. It's an "absolute savor" not just for them, but also for customers.

It's unfortunate that such a valuable option has been direly underused so far, and I'm quite sure that the sales gained by granting to players the ability to play on whatever system they like would outweigh the few that actually buy a game for multiple platforms.