I differ with you and think that it doesn't make political sense (for leftists) to create a dichotomy between "natural" and "artificial" needs, but it is probably true that a large number of people -- not just the devoutly religious and pacifist -- feel the way you do, whether or not they actually take a voluntary vow of poverty. Rousseau, for one, did:
***** The simplicity and solitude of man's life..., the paucity of his wants, and the implements he had invented to satisfy them, left him a great deal of leisure, which he employed to furnish himself with many conveniences unknown to his fathers; and this was the first yoke he inadvertently imposed on himself, and the first source of the evils he prepared for his descendants. For, besides continuing thus to enervate both body and' mind, these conveniences lost with use almost all their power to please, and even degenerated into real needs until the want of them became far more disagreeable than the possession of them had been pleasant. Men would not have been unhappy at the loss of them, though the possession did not make them happy.... <http://www.fordham.edu/halsall/mod/Rousseau-inequality2.html> *****
Non-Marxist critics of capitalism -- be they republican, communist, or reactionary, secular or religious -- often thought like Rousseau and resisted what they thought of as enslavement to an ever increasing dominion of needs. While Marx and Engels themselves didn't think of needs as Rousseau did, many Marxists since them have adopted Rousseau's attitude.
Rousseau-like resistance to an ever increasing dominion of needs, however, is in the end merely a defensive gesture, and a futile one at that in the capitalist world of anarchically planned obsolescence (e.g., it's often cheaper to buy a new model of X than have an old broken one repaired) and of constant innovations imposed by market competition; even cooperatives, unless they are _fully_ self-sufficient, cannot exist totally outside of the capitalist mode of production (that is why the U.S. embargo has hurt Cuba, for instance). Instead, we might aim for the world in which creation and satisfaction of new needs are democratically governed (in contrast to the capitalist world in which we have no control over them). -- Yoshie
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