The USD$90k 'stang

Every custom shop on the planet is now convinced that "limited edition" Mustang packages are a license to print money even though that idea has proven false many, many times. I can't tell you how many shops I've seen convinced that their body-kitted, supercharged and lowered Mustang was worth $70,000 because it said "1 of 300" on the door sill.

I have a 3 of 5 SWB Tbird. Does that mean it's worth a mint? Or is it just an orphan from the Borg collective?