I have done 10 laps or so, enjoyed them all but always sat at the cafe and asked around the riders how the circuit was, watched who was out and then decided to go round or not. Often did not, due to weather, discussions with riders or the fact the circuit had been closed for several days/weekends, therefore full of lunatics that thought they knew where they should be going! One visit after chatting with a silver haired Geezer with skin tight racing leathers on a BMW (of course), he stated " worst conditions I have ever experienced" I ordered another coffee and saved my fuel bill!
The hidden costs of crashing there are astronimical, recovery, barrier repair and the legal side of incidents, overtake only on the left and insurance is normally invalid, all can bite you later too.