Well he created a Swordsage and wanted a ring of jumping and asked if I'd create an item that boosted Concentration (which I found a headband or something in another book that boosted concentration).
Being unfamiliar with the Swordsage, I figured, "cool, he wants to improve some fairly mediocre skills that people don't usually care to boost with magic items". So I gladly let him have the items.
Then as we start playing, I realized the real reason he wanted the items. He didn't care about jumping or being good at concentrating....a Swordsage can use Jumping checks in place of Reflex saves, and use Concentration checks in place of Will Saves! This gave his 7th lvl PC a 17 saving throw score for both Ref & Will saves once every encounter. Which meant he was basically immune to the first Ref/Will attack in every encounter.
So on top of the better skill checks, these items suddenly became a lot more powerful than what I think a 2.5k gold item is supposed to be.
I'm a pretty modest player, and because of things like this, I've learned that a lot of players have ulterior motives when you think they are making modest choices.
Glad to know I'm not the only one that notices this in the game. That's why I'm always telling myself I will choose the magic items. Since I chose what magic items to put in the game as loot for the PCs that have played from the beginning of the campaign, I thought it's only fair to choose for the new PCs also so they aren't optimized 100% better than the other PCs. I just never have the heart to follow through with that decision