In my life I've sold two watches. A Breitling Grand Premier (about six years ago I think) and a JLC Master Date (about eighteen months ago). I honestly find the 'flipping' lifestyle very hard to relate to. When I buy a watch, irrespective of its cost the assumption is that it's for keeps .. its lifetime or mine whichever is shorter :)
For some here though buying even very expensive watches seems to be a bit like borrowing a book from the library. Not knocking it at all, each to their own but it's a bit bewildering.
Having said that since I've been posting here and taking more of an active interest in my watches the conclusion that more is less has become irresistible and I do intend to reduce my collection.