Amar
You seen that they've been chatting about the car and ad on RS246? I'm guessing you have as you know its past ownership
Bottom has dropped out of the market, as we know - hate to think how much I've lost on the S8 since December, but at least having bought it cheap enough for what it is there's less distance for it to drop.
If the RS6 is due a service shortly and you're prepared to take the risk of it picking something unexpected up (or having the warranty cover it, of course!) then defo worth a punt. Sounds like current owner stretched himself too far in buying it to continue running it?