I just read your post although it began back in 2018 already. You are really lucky as you just like those 3 big MK Runway watches. It looks like I have the same "habit" like you : I bought lots of MKs from the Lexington, Bradshaw, Runway Series in very different colours including Smartwatches in recent years. Here is a tiny impression of my collection so far ... :
However, I managed to stop to buy even more for some time now. At the beginning, it was a terrible feeling of "losing something, giving up a part of your personality, even denying yourself." Like somebody who has no access to drugs anymore. After a while and with some reflection, I am happy again and again when I see good opportunities coming but others buying my favourite watches online. I need to admit that I was taken out of that business not by my own choice, for some reason my online account of my favourite purchasing plattform got canceled so I was not able to purchase there anymore. This made me think and react.
Nevertheless, these watch topics will still be a big part of my life. But not with spending huge sums on that with more or less little control. From my own experience, I can tell that one needs to identify his own underlying wishes, dreams, preferences when it comes to a special interest like this. And then live through them as good as you can. This can be a mission that will last all your life, I started with being obsessed with watches more than 30 years ago. There is a lot of fun, excitement but also huge suffering and pain involved.
Finally, most things I ran after turned out to be a pure illusion when I finally reached them. However, I believe I still have some way to go to find my own piece of mind. But my feeling tells me that a final haven is in sight
Have a good day.