Because the Alaska Permanent Fund takes a small amount of revenue from the oil recovery fees and puts it in a managed fund whose interest is dispersed to the couple of hundred thousand humans left in this mosquito infested swamp. It has a total capitalization of about 45 billion dollars, roughly the same as the spectrum sales.
However, Alaska's population is roughly 735,000, the US 316,000,000. Assuming the same long term returns, the average US citizen would get about $1.80 per year. On a good year.
Disbursement of government money to the masses doesn't really do much. It is arguably different in Alaska since outside the 'big' cities, a significant fraction of the population is at a subsistence level and the close to $1000 we get each year makes a big difference. But many people have argued that the fund would do better if it were more intelligently managed. Of course, that term is defined differently by different people,