Socialism is implemented to bring about full blown communism, its an intermediate stage, the transition stage, to communism.
At least thats how the socialist leaders frame their oligarchy. They know communism will never come about so the ruling socialist elite will remain in power forever as they will always be needed to guide the process.
And those Socialist elite will always have limitless access to $$, power and resources for themselves, and will use them to make sure they are never removed from power, or their designated successors. See most of your Demonrats today (and more than a few Republicans, too).