Steve,
The SpotMog membership, free last year incidentally, currently £5, covers running costs which include postage, web site, regalia, and deposits for members organising our events. There are hidden cost that are born by members in organising events, such as petrol and accomodation. Again why use the the phrase "tax", we have enormous good will in our group, with members putting themselves out for the common good, which is very much appreciated.
George
www.spotmog.co.uk 
