Sure, if you can afford to do that. It's all about the in game performance and value for me. And trying to build a PC with few performance bottlenecks (such as RAM frequencies and latency to some extent).
But, you never want to be too far behind the top of the line I suppose, there's a always a balance to be struck. e.g work out if you care about the difference between 50 and 60 FPS minimum (and how perceptible is this difference when you aren't staring at a framerate counter?)
Getting things for a good price can also be a very good feeling . I seem to have convinced myself that £650 would be a reasonable price for a RTX 3080 FE, in hindsight I wonder if I will still think the same thing in 1 or 2 years time?
£650 for a 3080 founders edition IS reasonable. Not far off the most powerful GPU out there for £650 is in line with historic top of the range prices.