Good! For me these things make me overthink - how do such creatures come about? Did they recently adapt to draw energy from magic? If not, what did they use before intelligent races evolved and developed magic?
Where they the creation of some asshole god, or a wizard who wanted bugs to seek out magic items?
And here we see an excellent motivator for elves to seek adventure out of their utopic homelands.
And, visitors could get a major introduction in elvish culture once they inevitably fall into the 'servitor' role, as the elves, happy for something unusual in their lives, make the outsiders run all manner of errand in the city. Their unfamiliarity would likely lead to still more infractions making it harder to get out. Maybe they eventually cause enough chaos and disruption that banishment becomes a better alternative and that's how they break the cycle.
One of the PCs comes across a magical ring that grants some power but has odd aura as if cursed. Yet this curse is different than the standard curse. When the PC puts on the ring he/she suddenly feels married. There is now an illusionary woman, who he/she cares deeply for but who is also always very critical of the PC. The wife is demanding of attention and constantly giving the PC directions. The PC wearing the ring is the only one that can see and hear the bride. The curse can never completely be lifted. Even if the PC takes off the ring and somebody else puts the ring on; the PC will still be visited by the ex-wife at least once a month. During this visit she will demand money and apologies.