This tallies with comments made by Cauty at the time. "We nail [the money] to a bit of wood so that it can't function as it wants to. It's to do with controlling the money. Money tends to control you if you've got it, it dictates what you have to do with it, you either spend it, give it away, or invest it. We just wanted to be in control of it."
JMR Higgs KLF: Chaos Magic Music Money [Kindle Edition](2012) 2636/3140