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Besides put your money and time studying something unusal and make your collection different
Especially if you are beginning to collect a new area or era of stamps, I think it makes more sense to start out with building a basic collection first, learning what you can from the general and specialized catalogs about those stamps, before moving on to areas that are more "esoteric" and unusual. I can understand your point, floortrader, as a dealer who has had plenty of experience with handling stamp collections, but from the perspective of a collector discovering a new area of interest, it's probably best to start out with the basics first, then move on to the more specialized, esoteric stuff.
I mean sure, something like say crash covers from postal flights between France and her colonies from the 1920s to the era of independence would make for a fascinating collection, but it does require a bit of understanding of the basic stamps that would be included on the covers, their periods in use and what rates they may have paid when contemporary. Just jumping into something specialized before mastering the basics of the philately of a region can be overwhelming and potentially open oneself to being cheated by fakes, contrived items and the like.
As they say, one has to learn to walk first before you can learn to run. Forming a solid base collection of the stamps themselves is a good starting point from which not only an appreciation of the issues themselves can be developed further as the collection progresses.