I once bought a new car because I had to have leather seats. The car I had was not even a year old and the new one I bought was one year newer with the only differences being the leather instead of cloth seats and the color.

Another time I bought siding for my house at a huge cost when all it needed was a coat of paint. I became totally fixated on getting siding. I don't own the house anymore and have just about paid off the cost of the siding.