You might be misunderstanding my comment: They can increase costs if they want, but they should take the costs away elsewhere. I have no problem with a train ticket being 10€ and a plane ticket being 120€ instead of the other way around.
But this will lead to a plane ticket being (as an example) 80€ and the train ticket continuing to be 120€. While they do make more money off of 1st class and stuff, they still need to make a chunk of the cost off of 2nd class. Especially on more local (e.g. inside the country or just one over), where there often is just one class in the plane (And maybe there is business).
You might be misunderstanding my comment: They can increase costs if they want, but they should take the costs away elsewhere. I have no problem with a train ticket being 10€ and a plane ticket being 120€ instead of the other way around.
But this will lead to a plane ticket being (as an example) 80€ and the train ticket continuing to be 120€. While they do make more money off of 1st class and stuff, they still need to make a chunk of the cost off of 2nd class. Especially on more local (e.g. inside the country or just one over), where there often is just one class in the plane (And maybe there is business).