I too have some lurkers that I probably wouldn't count. A scrap wood pipe lined with tin can metal that was brought back from Haiti by a family member, a miniature pipe with a metal screen in the bottom that was probably not intended for tobacco, and so on. In my case, I unquestionably count my MM cobs, although I consider them less numerically significant because of their low cost. I give myself a pass on those, though I count them in my census. So my count may be in the high seventies or low eighties with cobs subtracted. Because of culling, I don't have any pipes I don't smoke. No boxes of old yard sales pipes or pipes of yore I don't smoke. A serious number of pipes are gifts or prizes, a dozen or more I'd say, so that gets me off the hook, to a degree, for spending too freely. If I'd bought only a dozen pipes, plus cobs, plus gifts and prizes, I'd have a generous and various rotation.