Pay or not pay

This is the machine where you can buy the tickets for the public transport in Wroclaw. Well, this machine is located in many of the tram and bus stops, and even within some of it. To use it is very easy because you can choose several languages??. I personally never used the machine, you can buy tickets at these machines and also are available in some newsstands. But I've never bought a ticket, I was lucky when dodging the reviewers, but it is a risk that can get very expensive.It is only 2 zlotys, and if you have student ID 1. 20 zlotys, also are available tickets for periods of time.