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I approach it a little different:
If I invest $150 on new shocks/struts that lower my car by a 1/2 inch. This saves me (just guessing) 1/2 MPG - saving me 10 dollars in gas a year. Then my your right my payback period is 15 years which is not a good investment. (Longer then the remaining life of the car).
However, If I perform A-B-A tests, document my results, post them here then hundreds of other people will learn from me and I'll make the world a better place. That is worth the $150 investment.
If my shocks/struts need replacing anyway and I just happen to buy ones that are 1/2 inch shorter, and they cost the same as the factory replacments, then they are "FREE" because I would have to buy them anyway.
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