Norway had a per-capita GDP 10x that of Venezuela when they launched their fund. The option was a luxury that they were granted by already being a fairly wealthy country.
Also, consider if 25% of Norway's oil revenue is sufficient to provide a basic functioning government. Now you have Norway saving 75% of their oil revenue every year, and Venezuela still sucking 5% out of other funds, resulting in a long-term extremely wealthy Norway and a destitute Venezuela.
The UK has the same amount of oil spread across 12x as many people. Yes, the Tories wasted it but it could never have had the same impact on the whole UK that it had on Norway. Perhaps if Scotland had been independent (most of the UK's oil is in its waters) it would have been similar.
Nonetheless it would have ha some positive impact, And, while I'm as anti Tory as anyone there does not appear to have been a lot of objection to the way the oil income was handled from other parties.
Also, consider if 25% of Norway's oil revenue is sufficient to provide a basic functioning government. Now you have Norway saving 75% of their oil revenue every year, and Venezuela still sucking 5% out of other funds, resulting in a long-term extremely wealthy Norway and a destitute Venezuela.