Mr pilot,
You do need to pay 15000 Euros for the type rating with Wizz air.
Your monthly salary is reduced by 1000 Euros for the first 15 months after you have passed the line check. This is why a co pilot caches net 1400 Euros per month in Wizz Poland during 15 months, however before the line check you have been making peanuts as well due to the training salary.
A Wizz co pilot here in Poland, with no remaining bond to pay, takes home in Polish Zloty on average a month, everything included, between 8000-10000 Zloty. (depending if you're junior or senior co pilot, how many sectors flown etc)
On top of this, what you're saying Mr pilot, yes you need to sign a type rating bond of 15000 Euros over a three year period.
ATR 250