Why would Sony care about making those games exclusive? I doubt that anyone is buying an Xbox for it's rich library of Jrpgs, so unless those games were headed to the 3DS....
Because of Japan and Europe normally likes JRPGs as well^^
Follow me on this journey;
Jrpgs come out on the Playstation because the Playstation is the dominant platform in the regions where Jrpgs sell well. Nintendo has no install base, Jrpgs don't tend to do well on Xbox. So why would Sony need to pay for exclusivity? Chances are that those games are/were coming to the PS4 anyway and Playstation already has the bulk of that audience. Sony would be paying for something that they basically already have.
Why? Because Microsoft could do the same thing they tried last generation. Buy these JRPG exclusives to hinder Sony's success. Microsoft did a lot of this stuff. Hell even HD-DVD was only there because they could stop Sony's success for a limited amount of time. That was the only reason HD-DVD existed.