Having just seen the ebay listing, it's not actually as bad as I expected from some of the descriptions. The trace damage to the PCB doesn't look that extreme and most of the damaged components can be sourced from RS Components for a few pounds. I've seen worse examples on other forums that came back to life. That said, people bidding £700 for it are being a bit optimistic - you could in theory get a 3080 for that price and having something 15% slower that you 100% know is working.
It definitely is worth picking a slow day when it comes to GPU modding. I had to re-solder my 3090 FE about fives times until I got the results I wanted and then all the hassle of the paraphernalia along the way - new soldering iron, better flux, resistors without a sloping shelf on the shunt, magnifying glass and thermal camera (hotspots). Always stressful, even when you're used to it.
what did you do to it? Shunt mod? Or something more extreme?