Replace the entire GAS TANK?

we see this often on Mercedes E320 and E350. first there's an evap code and fuel smell. after smoke test, we see the leak at the top of the tank. on this Audi, the labor alone is $1200. welcome to the world of plastic fuel tanks.

I see the tank available at www.parts.com for $1389 plus shipping http://www.parts.com/oemcatalog/index.cfm?action=getPartLocator&chapter=&year=2003&makeid=2&model=A6 and the book time to remove and replace this tank is 4.7 hours