I'm glad you started the thread because it's a good debate to have without getting in to arguments. I'm still not sure of your motivation to start the thread though other than clarifying your belief that they aren't versatile, which going by the answers being all in favour of them except for yours, surely you must now see the appeal of them even if you don't like them yourself?
Sure, they are less versatile than a navy or maroon tie, but that's just stating the obvious. And assuming you have a half decent tie wardrobe, it doesn't matter because how boring would it be to have a wardrobe full of plain navy and maroon ties and nothing else. You would have a wide colour spectrum of tasteful ties.
How far should you take that question? What about yellow ties? Purple? Orange? Green? Pink? All of those colours are far less versatile than brown that's for certain. At the end of the day you have to believe that there are no rules about this and it all comes down to personal preference and in all but a few settings (rare ones at that) like the interviews and dinners you mentioned), brown ties are completely acceptable for everyday business wear and certainly well liked here on SF.
Intellectual curiosity is the reason, and it has been an interesting discussion. As you say, "a wide colour spectrum of tasteful ties" is a good idea (for men who wear ties often), and this company wouldn't rule out brown as part of that (some brown ties are quite attractive). Still it is curious that, actually, brown ties probably are less versatile than bold colors such as purple and pink, which sometimes are seen at weddings and evening events, and maybe they're equally uncommon in business environments. It seems more than "No brown in town" is involved. Random thought: what if men who wear brown ties tend to be different in personality from other men?