Let's face it, if you're buying a $3K DSLR, you're most likely not struggling in the first place. You can get by with lesser cameras, period. Saying those that are buying one must have "money to burn" is just silly. This hobby isn't like buying beanie babies or something like that- ownership of new camera like this is more than just plain ownership. It's the excitement of exploring something new and seeing exactly what it can do first hand. If I wanted to blow money, I'd go to Vegas. I'm the type that loves to try things myself instead of reading about it or watching a youtube video.
I also waited several years after release to buy a 5D MKIII and when I got it, I loved it. Made me wish I had gotten one early on! I'm not rich, but my photography hobby makes me happy and I enjoy time out with my camera. Well worth the price at release if you ask me!
i preordered the 5D4 because i had a wedding to shoot in october (i pick up odd jobs now and then, still intend to keep this primarily as a hobby) and needed a second FF body, plan was to sell my 5D3 after the wedding + money made from wedding shoot to cover cost of the 5D4, just found out couple days ago that the wedding got cancelled because father of the groom had a sudden heart attack and passed away (so close to father's day too, so sad) and they decided to postpone wedding plans
because the wedding's now cancelled i thought about cancelling my preorder as well, then i thought to myself, i know i will definitely be getting the camera down the line anyway, how long will i have to wait before it drops a significant amount to make the wait worthwhile, all that time i could be enjoying this new body that i've been so looking forward to, so decided to keep the preorder (and now eagerly waiting to get my hands on that first batch)
sometimes is nice to splurge and treat yourself a little, as long as it's reasonable and within the means, especially when you're so passionate about the hobby (me being a bit of gearhead don't help :P)