With me it is not so much a collection per say. More like I have not thrown anything away. You can see the progression.
Same with me. I acquired all of those 3dfx cards from people that didn't want them anymore, or in used PCs. The only one I paid for was the Voodoo5 5500 back in 2003. I bought it off a buddy in high school for $60.
I have tons more video cards (and other things) than just the 3dfx set, which are either my old gaming cards or acquired from used PCs or customers that gave me their old stuff.
My video card progression went something like this:
Matrox G200 + Monster3D Voodoo1 -> Geforce 2 TI -> Radeon 9600 -> Radeon 9800 Pro -> x800 GTO -> 8800GTS G92 -> GTS 250 -> HD5870 -> R9 280x -> GTX 1070 Ti
I still have all of those cards except for the Geforce 2 Ti, x800 GTO and the R9 280x.
The R9 280x died silently one day, I came back from work and the machine it was in was completely dead. Turns out the card, motherboard and PSU had died all at the same time. Thankfully the video card had a lifetime warranty and surprisingly XFX sent out a new in box RX570 as a replacement, I was stunned to say the least. The board and PSU remain dead unfortunately, and I honestly have no idea why. There aren't any sooty skidmarks or burning IC smells anywhere that I can see.