I suppose it does depend what your doing with it.
An iMac Pro doesn't sound like an airplane when the gpu/cpu kicks in (apparently).
I didn't realise the ram wasn't user upgradeable in the pro.....
From Everymac:
Compared to the "regular" 27-Inch iMac models that this iMac Pro complements, the iMac Pro not only has a dark "Space Gray" housing, but also has a much faster and more advanced architecture and graphics architecture as well as faster memory and storage and additional connectivity, but is much more difficult to upgrade, an unfortunate -- and unnecessary -- limitation for a "professional" system.
I don't need it but it would simplify my desktop into one system. I have three desktops, a custom Windows desktop, M1 mini, 2009 iMac tied together with Synergy KM for my trading workstation. I have my pro trading programs on the Windows desktop with 2 4k monitors. It's an i7-10700 with 128 GB RAM. I do office and analysis stuff on the M1 mini (wish it had more RAM), and watch videos and personal stuff on the iMac. A big iMac or iMac Pro that could drive 3 4k monitors could replace all of the computers.
I am noticing more iMacs for sale (from 2009 to 2020) - it appears that many are planning to upgrade to Apple Silicon big iMacs which are rumored in March. I was considering selling my Intel MacBook Pros last year around May ahead of the expected WWDC release of the Apple Silicon MacBook Pros. And I have run into people that did sell ahead of that event. Only to be without a system when there was no announcement.
Another option would be to just get a 2020 MacBook Pro M1 MAX to drive the 3x4k + 2009 iMac 27 via Target Display Mode. What I'd like is an M1 MAX iMac 27 or mini with 64 GB of RAM.
What's a bit funny is that 2 M1 minis have the CPU horsepower of the iMac Pro 18-core. Not the GPU of course but two minis could drive four 4k displays. The weakness of the M1 systems is that you can only get 16 GB of RAM with them.