One day I took a 2 hour train ride for an event. I worked on the train and from a library at my destination. The event was almost a bust. The one useful piece of information I learned was preceded by the admonition “if you tell anybody about this I’ll break your kneecaps.” After lunch and train tickets, the day cost me about $70, with no loss in productivity. If I had a cheaper lunch I’d say I got good value.