The one advantage is that you can use knowledge of the game to know in what to "invest" as opposed to other stuff. Considering the game is a huge money sink, i

The one advantage is that you can use knowledge of the game to know in what to "invest" as opposed to other stuff. Considering the game is a huge money sink, it's very dangerous for anyone to see it as merely an investment. Those that do can make a LOT of money. There are some online exchanges doing very smart stuff (probably applying the same sort of stuff they do for stock trading). I used to play, and sold all my cards cheaply (about 2010), after that older format tournaments exploded and my collection would be 20 times more expensive today. I did do some very good purchases - I pre-purchased 8 copies of the Tarmogoyf card before launch for 2 dollars, then sold them years later for 200, and they would be worth 500 today.