I'd really like to see unity be more enticing.

Let's look at the rewards as a whole. Sparks, EXP, CP, Coffer

Sparks are, completely unspendable.
EXP is, ok 9000 for a level 128 enemy is reasonable, but yeah, it's just exp
CP is, per battle, rather low, 1750 for a level 128 enemy would be ok, but they are not affected by CP bonuses.

So far, we have absolutely nothing of value from winning a unity battle. The coffer, is a big mixed bag. There are some ok items, but anything that isn't those very few items is not fair reward for the fight. Honestly, a crystal cluster would be more worthwhile than 300g or a hecteyes eye or a buffalo horn or a bird wing.

To sum it up, the reason to do a UNM battle and actually use accolades is tantamount to null once a player obtains the singular item from the 10 or so battles of any value. What would be great, is to increase the rewards. Substantially. Even Voidwatch awards more EXP and gives Crour, which is at least spendable, unlike sparks.