Well, if you want to be more competitive, (Please excuse my grammar) then buying cards is better than bling. Of course there are always exceptions, where the cooler looking card is cheaper, Zoaroark GX for instance. But if you're going to focus on deck-building, flashy cards just distract from the battle, or influence it. Case in point, In Night March, I'm always more reluctant to discard the full art Shaymin EX, and more willing to discard the regular looking one. In my opinion, it's better to bling your main attacker and go cheap with the support and tech, because in my experience, the flashier a card, the better care I take of it, in battle and in collecting. But it's ultimately up to you.
What I meant is that there's no upside to playing with bling. It doesn't influence your results either way, but it costs more, when you could be playing more decks simultaneously, save up for more important things, so it's just a monetary hindrance for something that decreases in value the second you riffle shuffle. All of the top players know this, so most of them don't use bling at all if it's not cheaper or easier to get(a huge example of this is Zoroark GX), and they have to worry about travel expenses. If I weren't such an addict to foiling out my decks, I'd have every deck in my backpack whenever. I've seen and know people who bought shiny crap instead of getting experience from going to tournaments. They decided to to play decks that only play 2 Ultra Ball because they only had 2 gold ones.
I was actually going to say that myself, but thought I'd be seen as exaggerating the whole argument. Sometimes I do have to catch myself with putting in unnecessary cards just because I have them and want to use them, but then I have to tell myself, "Don't lose because you want to look cool doing it, you'll look cooler for winning.
Short answer: Yes.
