Why are computers of private citizens hacked?

[neku]

Powerless private citizens working at home do not have any important information on their desktop. Yet they find that their computers are hacked repeatedly. Other than causing losses and wasting time, what is the motivation of the hackers?

 

[eLdavis]

It's also possible that they are using their computer to access unsecured sites. There are some sites that are not safe.