Interesting - I haven't used one myself, nor when i was playing violin. Regular playing, storing pipes sensibly (case closed, not in attics, not in the sun, or near heaters or in car boots), and proper maintenance (drying bores after playing) seem the best approaches. Unless you are in an area with very dry summers (like Perth?) or very cold winters (ie, low humidity), I wouldn't think it's much of a problem. Ambient humidity in most NZ homes should be fine. But maybe some of the folks in Canterbury/Otago/Southland have another take? Pipes which are left upplayed for long periods will dry out and often crack - but the best solution to that is not to leave them unplayed for years
Re Jim's article, a lot of the pipes he deals with are ebony which is less robust than blackwood and more prone to cracking through moisture changes.