Wow, 12k thats very impressive.
My Dads been the chief fundraiser for a small local hurling club for years. The most successful nights are usually "Nite at the Dogs" which often generate 6,000+, a lot for such a small club... but they are very difficult to organise. Flag days tend to generate 2-3k, althought it depends on the level of footfall (we do them at 2/3 locations in the center of Mullingar). And the old reliable - the bag pack, generates several thousend, depending on number of hours/days done.
Most importantly, it really depends on the clubs reputation, and general public image. When I am fundraising (packing bags or selling stickers) for the hurling club, there is always a great response and usually good comments about the club... however when I do the same thing for the less public swimming club, the mood is much less generous... mainly because its a fee paying club and people think ity should support itself... obviously thats wrong... but thats another days argument!