I don't know if anyone has heard of a 200 club? Basically our local Cricket Club run one, and the aim is to get 200 "members" who each pay 50p per week, you are given a number, all the numbers are put into a bag and a draw takes place every week. So it's a bit like a lottery but with better odds!
They now have 250 members, raising £125 per week. Approx half of this is given back as prizes - there are 2 x £10 weekly prizes, monthly £50 prizes and then the big draws before christmas where they give a total of £1000 in prizes. It's been a brilliant fundraising idea for the club - over £3500 per year in profit for very little admin (you are only allowed to pay by standing order to minimise arrears etc.).
Could this be something worth considering on Purrs? Obviously it takes a while to get enough members to make this sort of money, but at first the prizes would just have to be representative of the amount of money being raised. Also each member can have more than one number - I would be more than happy to have two numbers.
I'd be happy to help if needed.