80/20 Frugality?: Spend more on...What?

Mr FS and I have a combined age of 124. We are close to retirement if we really want it. In fact, we are too old for early retirement. Not that we wanted it. What could be more rewarding than yapping about literature?

Every now and then, I make a vow in this space. Generally, I do not keep my vows. Everyone knows about the Pareto Principle, right? That's the idea that everything is 80/20. You get 80% of the results with 20% of your effort. Then, to get the other 20%, you need to put out 80%. This works with stuff also: we wear 20% of our clothing 80% of the time; we use 20% of our cookbooks 80% of the time, and so on.

This would mean that--in my frugal path-- I've gotten 80% of the benefits from 20% of the effort. For a long time, we put in the extra 20%: we wanted, for instance, to make sure our kids graduated college without debt. DONE. We wanted to pay off our house: DONE. 

Thanks to the recent swoon in the stock market, I have reverted to my 2008 behavior: I no longer look at retirement balances. Time is no longer on our side: whatever we save now will have a relatively small impact in the long run. 

That is disappointing, but freeing. It's hard to change habits. But I herewith vow to try to do only the 20% that will garner the 80% of results. 

So I'm trying to figure out what add-ons we should indulge in. Frugal Son wants us to treat him (and ourselves!) to more of the pricy restaurants in New Orleans. So we're doing a bit more of that.

I can't think of anything else. Any ideas?

Have you ever deliberately INCREASED your spending? On what?