I don't but earlier on I dabbled in building Danish and NAC collections. You can build a collection anyway that makes you happy and fits your budget. Other collection themes can be focused on brand/maker, shape, size and finish. 8O
I don't, but I am tempted, sometimes, to pick up a new pipe (new to me, usually an estate) because I don't have a pipe from that particular country. Tempted may not be the right word. The truth would be that I would justify a new pipe because I don't have one from that country. For example, I don't have an Irish pipe, so one of these days I will stumble on a Pete at the right price and, of course, I'll need to get it because I don't have an Irish pipe, etc. Come to think of it, I have no French pipes, either. So, clearly, I need one of those. Nice the way that works out.
Yes, kinda. I have some different sections as follows... "American Masters" and "European Masters" (both mostly Artisans) and under European I have subcategories, England, Italy, Denmark, and Ukraine so far, more to come. Then I have a central section I have labeled "The Greats" which presently has Dunill, Savinelli, Sasieni, and Erik Nording (want to add Peterson and Barling to this). Not that it's pertinent, but then I have a section I label "Historical" which are very old and mostly unsmokable pipes that are just cool to look at. And a final section I label "Macrabre" which has one each briar, meerschaum, and clay of that "genres".