It is not a matter of putting the costs back in their pocket, it is more of a moral principal, the team will charge you an excessive amount for paper tickets because the of the unnecessary luxury of it for the sake of a souvenir, comes at a great cost to the environment. To deter more senseless environmental abuse going forward, they are somewhat "penalizing your pocket" for penalizing the environment for a luxury, and they deem the cost to this unethical practice is 150$+tax. I would bet they give the proceeds of that extra cost to Environment Protection organizations at the end of the year, as some of the other sports teams have been doing who also charge a fee for this. This is far more about doing something for the environment because you are in a position where you can, rather than trying to mitigate costs of producing paper tickets.
Personally i've evolved with the rapid technological advancements, I try to use my phone for every convenience it allows, from online banking to movie ticket purchases to in store purchases. I'm glad I have less mail, i'd rather get a text when a bill is due than opening mail. I'd rather buy a movie ticket on my phone and just walk right in to the show, rather than go wait in line for 15 minutes for a couple pieces of paper that get ripped up anyway. Not only is paperless the right thing to do, it is also hassle free and actually more convenient 99% of the time. This is just another instance where people just need to evolve with the changing times, it is for the better anyway, in many ways.