To nit-pick, the driver's seatbottom had cleary been redone...no pleats, and I spy some other "needs", but very pretty car that's about $10K+ overpriced.
It is a nice looking example, and I know the 71-73 Riviera's prices have been rising lately, but I don't think by that much.
Sill needs a price adjustment. https://nashville.craigslist.org/cto/d/franklin-1973-buick-riviera-survivor/6805262347.html
While a nice car, no where near the asking price. I have judged these before and see many glaring errors/mistakes, the largest being the bottom cushion driver seat upholstery.