FFXIV on the Vita?

[Linkurrra]

It's really possible to be on the Vita and Wii-U. Sadly, Microsoft denied it for Xbox Live because they do not want cross-platform servers. DCUO agreed.

I know Microsoft denied and said they did not want cross platform servers, but any idea why?
Was it security issues? Or the simple fact of their competitors being on the same servers?
If it was the latter I think that is a bunch of crap. :P

They are probably thinking that they would not get the maximum potiential of sales because some sales would be lost due to ppl chosing Sony over Microsoft.