As someone already said.... How about not joining either side? I know it's a very novel idea but, frankly, the both options you mentioned are as rotten as they get.
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<--- Not gonna buy anything from the cash shop.
I dont want people call me "No life" or "Idiot" just because Im running around with Metallic Red coloured gears <-<
I already bought Sleipnir so I think I'm good for awhile. :p
Buy 20+ of each and screenshot the bank statement. That'll REALLY make me upset.
I already bought 2 platinum bands I think I am good when I ride my chocobo with my 2 dyable outfits and the lovely haircut :D
Or you can just buy the dyes, buy or craft some popular clothes, dye them and sell them for lots of gils and there you go, SE approuved RMT...
Meh, don't feel I want the dyes that bad, even with how cheap they are.
I wanted Sleipnir, I bought Sleipnir.
I didn't want minions and dyes, I did not buy minions and dyes.
Just how optional items work.
And if the OP is serious about spending money to spite people, I'm really sorry that you think people really care that much about who uses the cash shop. That's about as bad as believing that the cashiers at the grocery store think bad of you because you buy junk food.