There's already Armor sets, so you're already halfway there.
I find it's more a matter of willpower. Sure...I can buy myself that advantage...But then logic strikes me, that I'd be spending money I can use elsewhere on...well, +41 to a stat. It doesn't make sense to me, an I'm hardly enticed by it.
If I buy anything from the Cartel Market, it's because it looks cool. Like the Life Day Orb I bought this morning. Or the Frozen in Carbonite emote thingy. That's cool, and well worth the cost, in my opinion. And I never buy extra coins, I only rely on my monthly stipend I get from supporting that game.
But I guess I can see how it might be an issue for others. I just find it a simple matter of common sense and willpower to not buy the so called P2W items.
Consider that one of the several benefits to being a "Casual", I guess.