I'm not sure that there's an easy answer to the original question. In my case it's a specific set of writing characteristics which interest me, so in effect I've chased the nibs rather than pens as such. In all likelihood many people would regard my favourite writers as bargain basement level items, but I've always regarded them as tools. There is no strong correlation between price and writing performance in my experience, at least as far as vintage pens go.
On the other hand I suspect that it's worth putting more rather than less money into new pen purchases, on the basis that it would be easy to wind up with a large collection of mediocre pens without acquiring any which you really like.
Bookmarks