Another random question.. purely out of curiosity.

I believe that those cross-country (or even cross-half-country) train rides are more expensive than most plane tickets (at least when not in coach) and obviously way longer. Are there people who routinely travel those long routes?

Can I ask why? Just folks not in a rush/would rather enjoy the trip? or medical conditions preventing them from flying? (I was in that latter situation for a bit, but while in Europe)