you can but you'll end up paying X amount of dollars just to have it on the pc. You will have to tie the pc account to your ps3 account on the mog station.

Not sure if the time will stack (30 days) I think it did so on FFXI but on FFXI you can do a lot of things you can't do here, sort of like, playing the game.....OH SNAP!

if you want to dual box on different platforms with multiple accounts(legal)
You will have to pay for the game twice. Just make sure you make a new service account
1 for pc 1 for ps3
or 2 times for 2 different pcs
if you want to switch platforms on account you will need to buy the game 2 more times.
pc user must now buy the ps3 version and vice versa for the ps3 user.