The only kind of transactions i personally am OK with is some of the following:
-Cosmetics (Self explanatory)
-Gender/Race changer (Self Explanatory)
-Name Changing (Some people have a name they dont like and have had it for years)
-Mounts (Iffy, but it'll do)

That being said. This directly effects gameplay. its not super Pay to win. But it does effect gameplay quite a lot. It means 2 more JSE capes for some. The ability to more than over gear 1 job. etc.

But there's been no confirmation on what this will go towards. The game (FFXI), or something else.
Bare in mind, i'm one of the people who played Final Fantasy Grand Masters, and it was very... hmmm, Pay to win to me. FFXI has had some bad press because of that whole fiasco. That being said, there are other things i don't mind it going towards. But if it means boosting the in-game stuff for FFXI, i'm down.