Anyone can buy anything they want. But there's not a ton of reasons out there for someone to buy a prestige Swiss mechanical watch. It's not more accurate than a cheap quartz watch. Maybe you're someone that's super interested in mechanical design and fascinated by the complexity of gear driven measurements of time, but there are vastly less expensive watches you can buy to satisfy that interest. The real reason most people spend $6K+ on a watch is because they want to wear a representation of wealth and a status symbol on their wrist for others to see. Again, anyone can buy anything they want, but if you're someone that wears a watch like that, and clearly don't have that kind of income to go with it, it's the opposite of a status symbol in my opinion. When I see that, I think here is a guy that wants people to think he is something he's not. Maybe he thinks it's going to impress women, or make others think he's super successful, but really it looks like someone putting on a pretend show for others and it's not working.
So yeah, regular guys are allowed to save money and spend it on a super expensive watch. And I'm allowed to see that guy and think he's an idiot.