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HP and MP are almost always worthwhile, otherwise it's good to boost the Aeon's statistical holes, like a lacking amount of Accuracy for example or very low Agility, the required sphere-amount is relative to their current stat, so if an Aeon has only like 15 Agility, spending Speed Spheres to raise it doesn't cost a particularly large amount so the increases are that much more impactful.
Personally I would keep the upper limit at 50, rather than 20.
I'm confused why you're capable of increasing an Aeon's luck anyway, but that's a bad idea period, Fortune Spheres (and Luck Spheres) are part of the endgame grind on two particularly painful special repeatable boss monsters, and at that point, rather than spending them on individual Aeons, you could simply turn an empty node on the Sphere-Grid into a Luck+4 field and activate that with a Fortune Sphere for Yuna, Yuna's gains in Luck transfer 1:1 to her Aeons, so it is always simply a better idea to give Yuna the Luck over the Sphere-Grid, and not her Aeons.