The biggest factor for me came down to losing all the crystals on my 1.0 character. It would take many hours to farm an equivalent amount of crystals, and I've got some crafting to do! Other than that, I wouldn't care about re-rolling. I only played 1.0 for a month, so I don't have that much level progress. My 2 highest classes are cnj and btn in their early 20s, and I have like 80k gil, so there isn't a lot of time lost from re-rolling from that perspective. I just want to hit crafting hard at launch.