So it's affordable by the greater community? Seriously - the demographic are often students or casual workers, so they wouldn't have hundreds of dollars to spend on the game. A format that caters only for the rich is no fun for anyone. I actually hear people going on about the expensive staples of TCGs like Magic and how difficult it is to begin. Pokemon is unique in that way as it is much easier and more affordable to begin. For this reason is why this thread was made in the first place.
I'm not sure about everyone else, but I know that I have never looked at a game and called serious/not serious due to how much a single card costs. Instead, I rely on the word of mouth to determine if a card game is serious. Basically, there may just be a reason why I keep hearing of this TCG - along with Pokemon, Magic and Yugioh are those that I hear thrown around a lot. Also may check an official/fan site to see if widespread tournaments are available, as a larger tournament program might just suggest a greater popularity.
You obviously have the money to do whatever you want, so good for you, but keep in mind that little of us earn an income spendable on hobbies.
Unfortunately, Primal Groudon (nor Donphan) is not a very viable or competitive in the current format, meaning you probably won't be getting to the top tables in organised play any time soon. There also no viable strategy for making "playing Shaymin-EX hard". If there was a viable strategy, we would have seen it by now.
tl;dr The expense of Shaymin-EX is a very real problem, hence this thread in general, and calling a TCG "popular" should not be reflective of costs but instead word of mouth and tournament expansion. Shaymin-EX currently has such a high price as basically ALL top-table decks require multiple copies of it, and the Shaymin strategy does not have a reliable counter.
There is also a large amount of people who have already gone through school or have jobs, 50$ isn't a lot for your deck, more people play magic and the game is generally more expensive overall so how is it that more people still go into that game over pokemon? When every deck has a staple card that cost's 50$ per card you need 4 of in your deck per deck and it's never the smae card you could put in every deck unlike shaymin, so how is 2 cards at 32$ that much more. If this card is worth x it's because a large amount of players in the community can afford this card, if they couldn't the value of the card would lower, but the actual reason why people aren't willing to spend x amount on 1 card is because people are just being cheap even though they can easily afford the card or trade for it. Now it's getting to a point where the player base is just being to cheap about affording cards, shaymin being expensive is not a problem here.
I don't have the money to do whatever I want with it, I just know how to trade the cards I don't want for cards I do want, I haven't legitimately payed for a single pokemon card outside of my earnings for close to half a year now, and I still have to many cards to trade for what I need.
Groudon has made top 8 at various high level tournaments over the past year in all age divisions so that's where I tend to disagree with you completely.
This thread was made about a card devaluing another card not about the card game being cheaper for all.