You're missing what happened in the Netherlands when the gas reserves were found. The social-democratic government headed by Joop den Uyl - who thought the reserves should be extracted and sold within 30 years - used the proceeds to increase social benefits while lowering the acceptance rules to get government benefits. This had a large pull effect which ended up with more than 10% of the labour force getting benefits under the 'WAO' (an acronym for 'Wet op de ArbeidsOngeschiktheidsverzekering' or 'law governing insurance for those not fit for employment'). This way of spending temporarily available resources on expanding the welfare state got a name: The Dutch Disease. It was an example for Norway on how not to squander income from the oil reserves and a deciding factor in creating the oil fund.