I'll give it a go Linda
do some farmers get repeat visits, why so many in England
Yes, farmers do get repeat visits as the archives at
http://www.cropcircleconnector.com/interface2005.htm attest to. Some of the farmers cut the designs out swiftly as they are furious at people entering their grain crops. Others seem quite happy and are also researchers - and some put donation boxes by the fence into the field to either give to charity or against the loss of grain to be harvested and to help cover damage to crops by hundreds and even thousands of people visiting.
My theory on why so many crop circles appear in Southern England is twofold -
#1 They appear to perfectly follow the Michael Mary Ley Lines - which are the profound energy lines of consciousness that crisscross Mother Earth. The Druids and the Ancients built many of their temples along these leylines and established their sacred groves there. When the Christians came along they built their churches over these potent energetic centres.
#2 The first recorded crop circle appeared in the 1500's in a field in England so the Brits are set up for it. Pubs, campsites and B&B's in the regions welcome the Croppies every season and cater to their needs.