I've been there (used to own the OG Abyss for about a year, know Stealth, Utopia etc. quite well) and, to me, its just not worth it. And this is definitely not about funding such purchases. Obviously others hold these and other expensive models in high esteem, and I'm the last one to tell anybody how to spend their money.
Having those very expensive models may in some cases OK as technology advances through these models, and ultimately trickles down. Thats just fine. But in many cases I cannot shed the feeling that prices are just made out of thin air because *someone* is willing to pay ever more.
After my personal experience with those expensive headphones I limited myself to ca. 1,5K€. Sometimes I ignore that limit, bending it a bit, but most of the time I'm just happier with what I find around 1k. I don't want to miss my Composer, I'm quite happy with my PS2000e, I like my E3 -- though I sometimes think about selling it. On the other hand I do want to have at least one high end closed back available for when my family objects to my music at times when there's no separate room available
Long story short: perfection is somewhat boring. Which nicely makes the case for the mid range Grado models I think.