The problem with this analogy (and most analogies) about communism/socialism and capitalism is that the scale of a system involved largely determines how fair a system can be; and the kinds of checks and balances that can be made to make a system fair ...
To demonstrate this concept consider WoW, on a small scale (party) working together and taking an equal share of the rewards works out well for everyone because they can collect more gold and get access to better loot than they could on their own. As the system grows to the size of a Raid the system becomes less fair because many people can bot their characters to perform their role (and the player can watch TV) while other people have to work hard to keep everyone alive, and since the workload is disproportionate an even distribution of the rewards is not (necessarily) fair. If you take this concept to a higher level (like an entire server) it no longer seems fair at all that a person who played from day 1 and did all the grinding should be given the same equipment, level and gold as someone who signed up years later and has only signed in for a couple of hours to chat.
A modern capatalistic system is based on this, as a small group of people (founders of a small company) will share equally based on their hard work, while a larger group of people (mid to large company) will distribute the rewards less equally based on the value of the work done, and the system on the whole has a dramatically disproportionate distribution of rewards to benefit the people who have put in the long hours of hard work.
