True, but thats a once a year international event so entry is bound to be higher.
Worksop is the most popular series with 200 entries per round consistently for the last 3 years; thats of course indoors on a slightly slippy offroad setup so yeah indoor dirt = great success, but what would outdoor dirt = in the UK do you think.... (Im talking 10th, I understand there are already 1/8th outdoor dirt tracks..)
PS im all for developing a well known captive market of motorsport enthusiast at any of the full size circuits like silverstone