How much is this worth?

Romance of the 3 Kingdoms 4: Wall of Fire [NTSC US]

Complete with case, manual, and even the map poster that comes with it.

Checked eBay and saw how much others are selling it for?

I have no interest in selling, I’m just curious about it.

I got it for $21 NZ, which comes to around, about $13 US.

And I’m pretty sure it’s worth more than that, given it’s age, obscurity, and how it never got rereleased.

That’s why he didn’t suggest you to sell it - but rather see what others are paying for it.

Understand that something is worth only what someone is willing to pay for it.