To be fair when it comes to additions Wizzair have them too, and they even have a club you can join for 30 euro a year which will give you the cheapest fares and a 'delay warranty'. Card fee is a euro more expensive on Wizz as well and they charge a hidden fee on all flights from Ireland, claiming there is a ten euro government tax when it is only three.
Oh and if you are clever right now you can book a Wizzair flight from Chopin to Budapest now for 4PLN - current rates that is 95c. Totally crazy.
Wonder if they are getting any subsidy at either or the two ends? Maybe both? Otherwise it's not going to be sustainable for more than a very short while.