Value for a used VT30 65"

I would guess around $2,000...to maybe $2200.

I got a new 65 VT30 for $2550 shipped (before returning it because of issues). would not pay over $2000 for a used one. maybe more like $1900.

And calibrated doesn't mean it'll look great in YOUR house

If the greyscale and gamma are properly calibrated, that should apply regardless of where the display is being used, but it's true that a calibration is not necessarily 100% portable. Still, calibrated and with a 4-year warranty feels like $2000 or a bit more.