Flemke,
I, too, have a woodworking hobby and I constantly go back and forth with that and audio stuff. As far as woodworking being cheaper, have you bought any wood lately? It's not cheap anymore and I buy rough stock.
I don't deceive my wife about my purchases as much as not telling her the whole truth. After nearly 30 yrs of marriage I have found it much easier on me to let her get it out all at once!