Why buy a Ferrari when a Corvette Z06 offers similar performance for a fraction of the cost?
Why stay at the Wynn Las Vegas when the Comfort Inn also offers a bed to sleep on?
Why would you buy a 8,000 square foot house when a 1,800 square foot house will hold you, your wife and two kids?
There is more to the watches here than meets the eye. The materials used, the process in which they are made, the history behind the companies that make these timepieces, etc.
I don't think anyone here would be offended, but I'm sure you can look at the way you live and see that you have something that would get a "why the hell would you spend that kind of money on that?" reaction. We all do, its nature, we all want "cool" things.
BTW, I am getting rid of my Rolex Sea Dweller to fund a new "hotness". Hopefully I will have it soon and post pics.