And potentially lose all the attendees they already have in the first place? There's a strong danger of oversimplification here, I think..
They're already losing attendees hand over fist or they wouldn't be begging people to attend and bring a friend.
I am not comfortable with the idea of "begging".
In fact, I have considered Simon's post/email as a marketing message rather than a plea.
Towersey have jumped on that and taken advantage. However, good luck to them and long may they continue.
Cropredy is so important that I would drink warm lager there if it was the only beer available!