If you were to look at the various sports that get played all around the world at this current point in time, you would likely notice that baseball has started to become even more popular than it used to be not all that long ago. American sports have not had the same kind of global appeal as other aspects of their culture such as their food and media, but the rise of the internet has resulted in a situation wherein appreciation for American sports like baseball has stated to become a lot higher than anyone would have initially thought to be all that possible.
The thing about baseball is that it has players like Nolan Ryan that managed to make a huge mark on the game even though they did not have all that much professional help at the start of their careers without a shadow of a doubt. Ryan is well known for being one of the most famous pitchers in baseball history, and he leveraged his career to become a respect commentator after retiring from the field as well.
As a result of the fact that this is the case, a rookie card that you can find that has this player on it would certainly be a highly valuable kind of commodity for you to have in your possession. Some rookie cards for this player have been known to sell for thousands of dollars so if you have a bit of cash lying around you should definitely go out looking for cards like this since their value is going to appreciate tremendously in the coming years and could enable you to make a really tidy profit.