Makes sense because you've cut out the middle-man. I assume the actual amount paid would have been over £7900 via carwow and then they take a cut before giving you £7900, although I don't know for certain.It could be more...
I put my 2016 Skoda Superb on a Carwow auction a couple of weeks ago and was offered £7900. Miles better than WBAC which was £7300. I wasnt quite in a position to sell just then so I turned the offer down but made a mental note of the dealer who offered that price which was only a few miles from where I work.
Later, I called that dealer, took it round after work and after inspection, he offered me £8k.