At the level of funding needed to increase the capacity of metropolitan services, the possible additional income from more expensive classes is negligible. Cons

At the level of funding needed to increase the capacity of metropolitan services, the possible additional income from more expensive classes is negligible. Consider that public transportation is almost always subsidised, hence current tickets are already well below the cost of a trip. This is why many transport services offer cheap season tickets for residents, while making some additional cash (but still well below cost) from infrequent users such as tourists. At most, maybe some kind of new bus services which were "first class only" could be self-sustaining, but only at a very high premium which would make them ridiculously expensive and still barely worth it for anyone.