That's kind of a managerial antipattern. True, if someone goes an extra mile and does something outside her direct responsibilities, it is tempting to reward th

That's kind of a managerial antipattern. True, if someone goes an extra mile and does something outside her direct responsibilities, it is tempting to reward that person with more of the similar tasks in the future. But in the long run this only leads to resentment and curbing of initiative. More experienced managers will find ways to reward this kind of contributions. Also true that employees need to be smart about it. No need to volunteer for unglamorous drudge work, better do something that is perceived to be valuable.