Honestly even if I am not interested in a pair for myself, I'd rather see someone buy it and run in it than buy it than resell it.
My explanation could drag on and probably make me sound like some douchebag so I don't want to get too deep into detail into that (I'll get into it if you guys insists) so I'll just say this.
The Q&A and 1:1 meet-up is a great plus. It might be a once in a lifetime opportunity if you're a runner and a fan of Kipchoge. It's not just the Q&A that stands out for me, it's the 1:1 session, I assume that is a face to face meet-up and to have a quick word with him(?) no matter how brief is still a chance you may not have ever again.
I have 4 ZoomFlys (2 of them SPs) and 2 VaporFlys. I have ran in all of them except for the SPs but overall that is $1100 before tax on those shoes alone and I still plan to buy more VaporFlys once other colorways drops and likely more ZoomFlys once some goes on sale. $600 pretty much equals to 2 VaporFlys and I'd gladly pass on two/three pairs in the future to get/if I get the Elites.
I might pass on the new Pegasus until it goes on a deeper discount than I usually get them. I'll wait for the outlets at 50% off instead of jumping on the first 20% off discount. I also tend to buy a pair or two of Vomero a year and gotten several pairs of LunarEpics and not to mention from other brands like Hoka that will just have to wait.
There are easy ways to offset my running shoe purchases to accommodate the $600 price tag.
This is NT after all where for the most part we're glutton for shoes, I think it is safe to assume many here do not buy one pair to run down to the ground and then buy another so really $600 isn't the most reasonable purchase but it's not too bad if you look at the bigger picture.
I understand this way of thinking isn't for everyone and that is perfectly fine too.