What's the lowest selling system you own, was it worth it, and why/why not?

[Kyuu]

Once had:
Mattel Aquarius. Apparently sold under 20k lol 🏆

Still own:
GameCube

I enjoyed playing some of the few games that I had on both (or most on GameCube). RE1 Remake is imo the horror genre's and Capcom's GOAT. Aquarius had cool games...Utopia, Burger Time, Night Stalker, Advanced Dungeons and Dragons, Tron: Deadly Discs...