This is my original build back from high school in 2013. The only original parts that remain are the motherboard and RAM. This is what I upgraded throughout the years:
-CPU: i3-3210 -> i5-3470s -> i7-3770 -CPU Cooler: Intel cooler -> Cryorig C7 -> Corsair H100i V2 -Storage: WD Green 500 GB HDD -> Samsung EVO 850 SSD 500 GB -Video Card: Nvidia GTX 650 -> GTX 750 -> GTX 960 -> GTX 1060 -> GTX 1070 Ti -Case: Cooler Master HAF 912 -> Corsair Carbide 200R -> NZXT S340 -> NZXT H500 -Power Supply: Corsair TX550M -> Corsair RM 750i -OS: Windows 8 -> Windows 10 -Monitor: Asus VS228H -> Asus MX279H -> LG UD2458 -> Asus VG245H
As far as upgrading, I honestly do not have a reason to. I am not against upgrading, but my system plays all my games at the high-very high graphics setting at 1080p locked at 75 FPS. I think my CPU and GPU upgrades helped throughout the years. We will see.