Silver Supporting Member
Association, IMO - positive association between dark boards and certain desirable vintage guitars, e.g. bursts and early rosewood Strats, whose boards tend to be on the darker side (for whatever reason... as suggested above, perhaps they didn't start out that way?). And, on the flipside, negative association between light boards and perceived dryness (whether that's the case or not)...I have no idea why people like "dark" rosewood. It looks like a faux wood product.
For me there is something visually appealing about the contrast of a dark 'board against light inlays and light binding.
I have a really nice LP that is a tremendous guitar but I admit that I nearly sent it back when I opened the case for the first time and realised that the board wasn't quite as dark as I had hoped it would look (albeit there are many lighter examples out there, not least from the auspices of the Murphy Lab).