Money talks. Stack up some examples of what $6500 per year will do.
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Rent a nice car while the one you have is repaired, should the engine self destruct. Annually.

Or a brand new car every 3-5 years, paid for with cash.

Trip to Hawaii. Or two. Annually.

Wander around Europe. Annually.

Cruise(s)? Annually.

How many years would the extra funds advance retirement? Retire early, and fit to boot!

Is there someplace she's always wanted to move to?
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All this talk about financial security and/or lavish entertainment seems to go over well with Wives. Before you know it, it will have been her idea all along...