I have a little bit of a different perspective. Some customers will force you into an analysis based on their model of COO, but if there is only going to be a few percentage change from one product to another, is Cost of Ownership really the answer to the question, "Why should I buy your product?" If it is not the answer to the question, then you can't sell that way because nobody cares. What's the cost of ownership for both a $20,000 Chevy and Ford? I don't think there is very much difference per mile or per year, but if you can produce something dramatic with COO then you can get people's attention. COO was one equipment manufacturer's key selling feature. The company went in with a 3x improvement in productivity per capital dollar. That is the most important thing in the COO model; everything else runs about the same. If you win in this measurement you will be dominant, proving everything else is characteristically close.
When you are selling, the question is "Why should I buy your product?" If the customer doesn't care about COO, but some performance, safety or convenience issue is key, that is the answer he is seeking, not COO.
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