I had curated perfect-to-me PS1 and PS2 game collections, and had the later, smaller versions of both systems. Both whole collections fit in a bread box, but I gave both away to save space. I cannot believe how much I regret that.

Also Dreamcast but for a different reason than most. I learned it played burned games by default 10 minutes after I sold it.

I regnet selling my Atari Jaguar. My Brother and i only had 3 Games If i remember correctly. One was Alien vs Predator and it was a blast. We sold it to buy a PS1.

My Atari 2600 with 80+ games. Only because I saw it sold for like $40k decades later lol.

I ain’t getting rid of my PSX.

Super Nintendo - I was in my mid teens and my mother coerced me into giving my Super Nintendo into my cousin, but I have regretted it ever since.

Coincidentally, Super Mario RPG remake is coming out in November and will probably make me feel fine again!

I have the same regret, I gave my N64 to a family friend in the late 90s. However, I later bouught a replacement N64 with two new-in-box gold controllers so I can still get my GoldenEye fix.

One of my old friends dad sold the atari jaguar. With multiple controllers and a pretty full game library. Pretty sure it was worth a pretty penny then too but he didn’t think twice about it. Would probably fetch over a grand now for the collection.

I slightly regret selling my Wii U to get a Switch but I think there’s still time to backpedal on that one without it being a huge loss.

I returned a Gameboy Micro. I really want one now and I could have just kept mine from back then

On a totally unrelated note, I’m craving Jolly Ranchers

Never personally sold any of my previously owned consoles, but I did “lose”* my Super Nintendo around 2001 and, sometime in 2011, my older brother messed up my PSone’s lid and it “disappeared” shortly afterwards.

* This loss was either my mom or aunt getting rid of it because "nobody is using it anymore, it's just wasting space and gathering dust". The same end my brother's CCE Turbo Game (a brazilian famiclone) had when I was even younger

Yes and no. I had a modded Sega Saturn with a ram cartridge that I traded in to afford a Dreamcast when it came out. I love the Dreamcast so it wasn’t a bad trade, but I do wish I still had the Saturn too.

Trading my Neo Geo AES and some AES games for a modded PSX. Both me and my friend that sold the AES to me are both kicking ourselves.

I made up for it by buying a 2 slot MVS board and consolizing it…and getting a 4 slot MVS cabinet ages later.

My mum made me sell my Gameboy Colour, which was still in great condition, for a 10er at a flea market. Still get sad about it any time I think about it… Was my first ever console and probably the reason green is my favourite colour now.