Raspberry Pi CM4 or CM5 carrier boards doesn’t cost that much.
The followings are two examples of CM4 and CM5 carrier boards I’ve designed.
For prototyping, I used JLCPCB and it was ~$600 for 5pcs, including shipping.
It’s equal to $120 per board.
But for 100+ bulk PCBA, the unit cost drops down to $35 ~ $50.
I think if we make a CM5 motherboard for Framework, the price would be similar.
It’s definitely more expensive than CM5 itself in terms of 2pcs or 5pcs prototyping.
But if someone suessfully create it and resell after bulk PCBA, it can be cheaper or similar priced to Raspberry Pi CM5.