Your prices are msrp for unused components.

On my local equivalent of ebay/amazon I can get a used 3080 10 GB for $390, ryzen 9 5900x $265, 32 GB DDR4 3200 mHz $170, new b550 mobo $80, 750w psu 80+ gold $70. $975 total. I didn't count anything else coz a lot of people already have those things from their old PCs and they're super cheep. For a full ~$1000 build add a $60 512 GB sata ssd. Cooler will set you back $15, same as a 1080p screen, case and m+k combo and a lot of the time you can get those things for free and they will last you a lifetime.

This is my first ever keyboard that I got for free from an office that was closing down and I use it to this day. Eventually I had to buy a PS/2 to USB dongle but that's like $5. I have a 2nd spare one in case the 1st one breaks. I plan on using it till I die.