IMHO, never enough I try not to think about the money part. It's a hobby like anything else...it's money lost. My point to my wife was I work my A$$ off and I am going to enjoy some of my hard earned money. Granted I save allot and I never spend beyond my means. To me modding my car is one of the true joys in life and why deny yourself that!!! However if I did a spread sheet I would probably make myself sick