Despite these days, not most men wear necklaces, not to say expensive ones, since desire a lot of time is something you can't get, would luxury on the neckline maybe a desire?
there are necklaces brand but there isn't really a line that create for professionals to possess such thing? to feel it's not gay/feminine/gangster looking? or in general provide the right connection to what men prefer. or just, they hate the idea that's it?
men are into emotional connections. they like to possess objects that give them unity, history, functionalities, faith, strength, timeless, etc.
so, I would say a necklace CAN POSSIBLY CONTRIBUTE to few of these factors. to me, necklace is the closest accessories to their heart. men's habit on necklace, if they wear it, they don't change it as often as how often women do. so it can be a emotional connections. they feel they belongs to it, or vice versa. united. also, if it is made of gold/platinum (as in you found in watches) it give them strength, power as in luxurious, and timelessness as it will last forever and more expensive that you will treat it more carefully. and these days, men do like to take care of themselves. look at the metro sexual, and the 007 alike.
so maybe men actually may want a necklace, just forbidden by the society, or there isn't one that give them the right feeling, that's all
