Needing to be wanted, Wanting to be Needed

For awhile now, and especially with the current recession we are in, I've been thinking about the goods and services that individuals provide and the "value added" that comes with them. What is the definition of a job? Some jobs have a very direct link between the payment received and the services offered (money paid to a hair dresser or fees paid to an architect for example) while others have a less tangible relationship (the commission paid to an artist or the money paid to actors on broadcast television which comes from advertising revenues, or even YouTube stars who make money off advertisement revenue). At the same time, people can either make money for providing services and goods people want, or those that they need. As a society develops, opportunities for pursuing careers providing things people want (art for example) increase, but those that provide what people need (agriculture for one) don't go away. I don't mean to say that the connection between payment for things people want is less obvious than that for things people need. Those payments are, however, choice payments, not obligations.

Is it more fulfilling then, for the individual who provides the services people want, knowing that they don't need them to survive but derive enough enjoyment from them that they are willing to pay (please avoid any comments about prostitution here, the complexity of that is beyond this discussion), or for the individual who provides the services people need (and for the sake of this discussion we will consider the farmer, and not the industrial agriculturalist)? I personally haven't decided which it is I would rather prefer, plus it seems the lines between want and need blurs once you get beyond the base of the Maslow pyramid. But still, there are certain services that are clearly more necessary than others for society to function, services that would immediately leave a gaping hole if they disappeared tomorrow (think along the lines of a shortage of rice versus the discovery that Britney Spears lip syncs). I ask this question because I don't yet know the answer.