Intel has very steep prices on high-end Xeons because they support up to 8 socket configurations. Not because of monolithic design.
Support for multiple sockets is very, very expensive. As in they can take you to the cleaners. If you're unfortunate enough to need 8 sockets, they've got you by the balls and they're going to milk you. You can check 8 or 16 core versions which should be available across the range and you can see the steep premiums you pay for 4 or 8 socket support for otherwise the same CPU.
Unfortunately, the highest core count chips are only available in 8 socket versions with astronomic prices. With one exception (AFAIK), the 28 core W-3175X. Which proves my point. It costs a fraction compared to the 8 socket capable Platinums. Before the discounts, Intel was asking $3k for it. I think even the cheapest 28 core Platinum was over 10k. The 8280L is like 16k. More than five times the price.