[monster2control]

This is essentially how life works. Ever do a group project, volunteer, anything that involves a group of people? It almost always devolves into about 10% of said group doing all the work.

[peakaboo]

Because people rarely can contribute in equal amounts, unless it's something simple, like walking.

[hubraumhugo]

Yes, the Pareto principle is similar and states that 20 percent of a group will produce 80 percent of the activity.