I've done this exact thing...sell off a versatile collection of watches to fund a more singular "grail" purchase. In fact, I've done it twice (once being for the BB58). In both cases, I found that a one (or even two) watch collection falls short of feeling well rounded, and I quickly get annoyed/bored. In both cases I reversed course, sold the grail, and diversified my collection again.
Like you, I have a number of expensive hobbies, and I just can't justify tying up more than several thousand in watches. So, I've end up determining that, for me, a modest, rounded collection of watches in the 500-1500 range is where I'm comfortable. YMMV, of course, just sharing my personal experience.
I'm convinced at least half of these "is it real or fake" posts are from people making fakes trying to hone their craft/see if their current model can pass a litmus test.