Thanks for the feedback!
I decided to keep the player-facing information about the buildings simple . They get gold, attract heroes and sometimes both (indicated by "benefit"). I felt adding statistics in numbers (e.g. this building obtains on average X gold per tick per hero) was out of place without making the rest of the interface significantly more complex, and there was no way I could add (and tune) that level of depth this jam. If I were to continue this then I would definitely also provide more detailed information about the working of each building.
Fun (?) fact: each player has a generated class and profession, so actually mages only visit the mage tutor and never the warrior tutor. But because each player is created uniformly at random, it averages out that the mage vs warrior buildings are equally effective. One idea was to make your town particularly attractive to certain classes/professions, motivating players to make your town their 'homebase' by e.g. setting a hearthstone at the inn or using it as a respawn point.