I have done some figures to show how many memberships clubs recorded from 4th Feb 2010 til the end of the 2010 season.
This may give you an indication of where your club is at now and how many more members they may get. (Totally unscientific, but it's an idea)
First column = 2010 total memberships
Second column = number sold at this time 2010
Total = number sold between Feb 4th til end of year
Brisbane Broncos 14,179 - 11120 = 3,059
Canberra Raiders 6,134 - 2,990 = 3,144
Canterbury Bulldog 11,886 - 7,071 = 4,815
Cronulla Sharks 4,873 - 2,454 = 2,419
Gold Coast Titans 5,441 - 4,179 = 1,262
Manly Sea Eagles 5,112 - 2,279 = 2,833
Melbourne Storm 10,360 - 1,416 = 8,944
Newcastle Knights 8,485 - 5,012 = 3,473
North Qld Cowboys 9,180 - 7,460 = 1,720
Parramatta Eels 11,133 - 5,950 = 5,183
Penrith Panthers 4,541 - 2,414 = 2,127
South Sydney 18,716 - 8,871 = 9,845
St.George Illawarra 15,345 - 8,801 = 6,544
Sydney Roosters 6,116 - 2,447 = 3,669
NZ Warriors 4,834 - 4,069 = 765
Wests Tigers 6,526 - 3,526 = 3,000