Well according to a relative of mine who worked in Saudi Arabia for a year, the cost of living in Saudi Arabia is relatively low (I am not factoring accommodation as his company took care of that), food and groceries and whatnot are relatively cheap, not to mention that there are fewer spending opportunities compared to other gulf countries like the UAE or Qatar for example, so you won't be tempted to spend a lot. Also if the hiring patterns in Saudi Arabia is similar to that of the rest of the gulf countries, your salary would very good (Europeans and US citizens are usually given higher salaries than other nationalities). So if you can handle the cultural difference and strict laws, I recommend you go for it.