We really do things in a big way here in Ibiza. Here's a snap of San Jose's multi-modal transport interchange, or the bus stop as it is sometimes referred to.
My sister, waiting there for the bus to San Antonio, fell into conversation with another English couple who complained that the bloke in the ticket office didn't seem to know anything on the subject of buses. Our Kris explained that the kiosk was, in fact, where people bought their lottery tickets for ONCE, the charity for blind people.
Having said that, if you do go to a real bus ticket office, especially the one in Ibiza town, they too will know sweet FA about bus tickets, times or other related bus information.