I moved to Warsaw, Poland, earlier this week and got myself a 3 months pre-paid ZTM card. However, none of the locals that board buses or trams with me seem to validate their cards or buy tickets onboard. So far I've only seen 1 or 2 people other than me actually use their card, and I've taken over 20 rides already.
Am I missing something here? Is it unnecessary to validate your card on every ride as long as it's not expired, or is there just a lot of people not paying for their ride?