Because I'm not in love with the car.
None of this is meant to be offensive, please take it with a grain of salt.
The color is nothing special, and the paint scheme with the hood stripes isn't very flattering on this color/body style.
The interior is bordering on shot. Carpet needs replaced. Upholstery needs done. Unless you think you're capable of doing this yourself (which isn't difficult, btw) then you're looking at some cash there.
Unless it's a super well equipped 67-68 vert, in mint condition, it won't bring the money you're looking to put into it.
If it's exactly what you want, and you love the color and everything, then buy it. If not, you're going to spend a LOT of money making this car right, and making it what you want.
Just my $.02. It looks solid. No disputing that. I'm just not a fan of the color combo.