Quality matters and quality costs more. These new Mac Pros aren't for everyone. They are for content creators who demand and require top notch performance to optimize their workflow.
Using workstation/ server level components and parts and materials add costs. Which is why an HP workstation is more expensive than a similarly configured white box PC.
That said over the past 5 years many creatives felt forced to jump from Mac to an HP workstation. For those that did I think very few will pay the premium for these new machines.
For those who stayed loyal, it's what they've been asking for all along. They will find a way to pay the premium. Because they need the performance and understand it's an investment that will give them ROI over a few years.
Mac Pro now Available - Apple https://www.apple.com/mac-pro/
Mac Pro 2019: release date, price and specs - Tech Radar https://www.techradar.com/news/mac-pro-2019-first-look
Apple's most expensive Mac Pro costs $52,599 - The Verge https://www.theverge.com/circuitbreaker/2019/12/10/21003636/apple-mac-pro-price-most-expensive-processor-ram-gpu
Mac Pro: All-New Design, Starting at $5,999 - MacRumors https://www.macrumors.com/roundup/mac-pro/
Is Apple's $52,599 Mac Pro overpriced? - ZDNet https://www.zdnet.com/article/is-apples-52599-mac-pro-overpriced/