If you bought the game on steam and that's what you're using, that is your pc account (forever with steam). Even if you were to purchase all 3 as non-steam versions it would be creating an entirely new account.
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Stormblood itself includes Heavensward for anyone who doesn't have it yet, so you wouldn't need a separate HW purchase except to play it in the meantime before SB comes out. Once it comes out, you'd need ARR + SB for each platform you play on.
If you have both PS4 & PC, you'd need the expansion for both of them, but only one of those would need to be Collector's Edition in order to get the CE bonuses. So, just like with HW before it, the expansion itself is per-platform type, but the bonuses are account wide.
Same; I liked my HW artbook the most out of the entire collector's edition bundle, but would not be willing to pay $200 pretty much just for that. I had high hopes for the dragon statue, but felt it was cheaply made and mine still doesn't sit properly on the stand, so not chancing it with a statue of some Garlean dude I don't even GAF about.
Me after seeing the price of Collector's Edition is 200$ http://i.memeful.com/media/post/kRp3WkM_700wa_0.gif