I think the "exit corner, check your mirrors for radicals, move to the right if on a straight, don't dive the inside, don't go round the outside" that we all learn pretty quickly on trackdays is worth much much more than having done 1000 laps on a computer game. I have zero interest in TF I'd REALLY like to do Spa and Nurburgring and Bilsterberg, but Bilsterberg really would require a trailer (which isn't impossible).