Yes, "Let them eat cake!" ...Interesting thread indeed. The person making the original post has obviously never owned Phase products or dealt with the company. They are both a dream to deal with, great products and great people worth the money IMO.
MF products are pricey but the quality difference was obvious to me with the first exposure i made on the P30+. The difference in price pales in comparison to the cost to staff a studio running or travel expenses for a busy landscape photographer. Add in marketing and production costs and the difference to upgrade to the best kit available doesn't seem so high, especially with the generous trade-in programs if you stay current.
In the past twelve months I have been in 22 states, Argentina, Australia and Antarctica. I couldn't imaging spending the money required to travel and not have the best equipment to do my job. Seems silly actually.
Phase has the broadest market strategy in the MF marketplace. Anyone who can afford a D3x and full kit of lenses can opt into MF with phase, leaf or Mamiya products for a small price premium.
I know several Canon/Nikon shooters who have or are contemplating the jump to MF by purchasing one of the trade-in backs. There is as much a market for those recon'ed backs as there is for the backs they are traded in on. They usually run out of them once the upgrade cycle nears completion.
As Don Libby mentions, the P45+ is still a great back and like him I have several P30+ and P45 images that well and I haven't owned one for a few years now. With each new version of C1 I can go back and reclaim a few images from those archives of hard drives. On of my most popular images was a P30+ file from which C1 v6 allowed me to finally produce a quality print.
Phase is at the top of the MF food chain because they push the envelope. Their technologies are not cheap to develop. I recently met a few of the Phase One staff at an IQ180 release party and they are very passionate about keeping their customers on the leading edge of what is available. They are already working on the upgrade for the IQ series backs and you can't even get them yet. Chip design, software, hardware engineering is a constant cycle and keeping those wheels in motion is not cheap. As incredible as it is those technologies are they do make their way into their lower end offerings.
My suggestion is compare the entry level and slowly upgrade to the higher end. The difference in quality is worth the money.
Despite the rambling endorsement ad for Phase One, it wouldn't hurt to go back and re-read the OPs original post. It is easy to blow off his appeal using our own lofty justifications ... especially here on a forum that attracts those able to foot the bill (or at least the vocal members seem to, including me BTW).
Perhaps think back to our own entry, or an earlier part of our own photographic experiences. Heck, it wasn't all that long ago when I had to take out a loan to buy a Hasselblad V camera to shoot film for commercial jobs. But hey, it was worth it, you bought it and used it forever ... or so we thought.
Then the paradigm shift to digital media (print and electronic) changed everything overnight. I went into debt for a $12,000 Kodak back ... but in that time of transition from film to digital, you could charge a digital capture fee and justify the line expense as off-setting the film scanning charges. In many cases that way of paying for digital gear has now evaporated for most working photographers. The point is ... if you were in on the ground floor, the upgrade path curve was a bit more gentle, and many of those riding the upgrade train have a history stretching back some time. However, add up the actual cost of 10 or 15 years of upgrades if you dare. It is a sobering exercise.
Frankly, there has been a second paradigm shift in the past 5 or so years ... where the new product cycles are growing closer together and are bigger jumps (technically and financially) and the curve has become ferociously steep ... this, while the income producing potential of photography has become generally lessened, and the over-all demands for image quality has most certainly been down-sized as electronic media went on the ascendancy (the competition for digital backs isn't against $9K Nikons, it's $2,500 5Ds). Add to this the expense of now needing to upgrade your lens systems, which both major players are doing, and we're getting into some pretty rarified usage and financial territory.
It will be interesting to see how long-term this business model will sustain itself before it is indeed a product category for governments, institutions, wealthy dabblers, and a few highly successful photographers (if it isn't already) ... where not so long ago, one could spring for that V camera or RZ and be on the same image quality level as the rich and famous ... where knowledge and talent was the key perceptual determinator for the majority of working photographers. Note the word "perceptual" because this "better gear" has oddly become inextricably linked to somehow equating to better work no matter how vociferously we'd deny that ... there is definitely an air of superiority attached to it thanks a great deal to the marketing efforts of those duking it out for market share.
Just an alternative thought or two.
-Marc