Being offered a contract with Storm, at the base of my first choice. They told me that I would have to set up my self in a company in Ireland, for taxation etc. For a month of 10000 Euros gross earning, you end up about 4800 net. Add on to that your business expenses and you can increase that, depending on how much you can claim, but its not a lot and are not repetitive (headsets, uniform, subscriptions, internet, etc). If out of base flying then you can claim basically everything but at the end of the day is your money that you get back and not something extra. So basically one can expect about 5000 Euros net per month for 900 hours of flying. So if in winter you don't fly as much and your yearly average is 800 hours then your salary will be reduced accordingly.
Obviously is not a lot, and probably they are better jobs out there. It all depends on one's choices, circumstances, etc.