Work / English teachers in Poland - why are they so unhappy? [89]

Sorry if I'm missing something but as I understand as an English teacher you normally recieve around 50zl per hour.

By my calculations that comes to roughly

25 hour week (what I have heard is the norm)
25 (hours) x 4 (weeks) x 50 = 5,000 per month
or
40 hour week
40 (hours) x 4 (weeks) x 50 = 8,000 per month

Even considering ZUS and tax it still seems pretty ok, maybe I'm missing something?

Should I be including travel time or prep time into my calculations?

If no, then I would say teachers earn a pretty decent wage for Poland.