Yeah Xilinx’s pricing curve is incredibly steep. Probably makes sense since they’re used in things like defence (radar, electronic warfare) so they can sell them in low quantities for huge prices and people will still buy them.
But with decent volume they get pretty cheap - for example there are video converters they have FPGAs in them that you can buy for less than you can buy the FPGA part in single qty - which means the manufacturer of the device is getting the FPGA for 5-10% of list price.
Wanted to buy a GOWIN FPGA recently, like on Sipeed's dev boards. Mouser wanted $37 for it, more than twice what the whole devkit costs.
Meanwhile the list price from the manufacturer is $3, but it's completely impossible to order anything as an individual. Not sure why they designed a hobbyist beginner-friendly dev board around a part from a company that makes all their products impossible to buy...
But with decent volume they get pretty cheap - for example there are video converters they have FPGAs in them that you can buy for less than you can buy the FPGA part in single qty - which means the manufacturer of the device is getting the FPGA for 5-10% of list price.