my mate has a sluch fund, ANY money that he makes from cash or otherwise, any money that is left in a pocket, any he finds etc etc goes into the slush fund. At last count he had close to 10k in it and that is where all his play money comes from. Any track day, semi slicks, parts, pretty much comes out of that except he is smart and takes a little money out of the bank account so that she thinks it costs heaps less than it does. Me, got no money to spend so don't have nothing to hide.