That's the problem with the Protestant Work Ethic and Utilitarianism, still deeply ingrained in our western culture -- value and self-worth are equated to being busy, and utility. "A poor life this is, if without a care, we have no time to stop and stare ..." (not sure I've remembered that correctly, one of my mother's sayings, a line from a poem by William Davies, a Welsh vagabond poet). The way you've worded it captures the essence real neat of being 'useless' -- more uselessness, I say!