Yep, apple tax pricing, $3,000.00 for getting an "expandable" mac studio.So, $300 worth of cards justifies the extra $3,000 to get the slots. Makes sense
In the PC side, this is also expensive, if you want a motherboard with 7 PCI express slots, those motherboards costs about $1300.00, a normal motherboard would cost about $300. So is about $1000 more, plus the CPU, which you will have to use a server CPU instead of a desktop CPU plus ECC RAM instead of normal RAM.