It appears a little high to me too, but it might be worth it.
It's a W124 300CE, which were sold in limited numbers to begin with.
It's an incredibly clean, low mileage example, of which there are likely very few left.
It's also in what I believe is a very rare color. It looks a lot like almandine red, which happens to be my favorite color in a Benz.
If I was in the market for a W124 coupe, I'd pay the price and never look back.