you sell them to "gamers" and let them go broke. a neatly packaged custom rig can recover the cost, at the very least, if not make a tidy profit. Or you make a youtube channel about it.
alternatively, you buy one or two components here or there as they get outdated and swap them them out. Or you do what I did for my first Beowulf Custer... raid Dad's "computer parts shelf" (he's a unix admin... pretty sure having decade's old spare parts on a shelf is mandatory for the profession.)