Azlan said:
I call these items "weenies" because they are relatively cheap magic items, and by themselves they are not very powerful; but when this combination of items are stacked together on a single character (and their bonuses do all stack!), they can make that character powerful indeed (particularly if that character is only mid-level). With the starting wealth of only a 7th level character, you can buy almost the entire list of items! (An 8th level character can buy the entire list, and still have change left over.)
Perhaps you can define 'overuse' as you see it. If you mean that all players purchase them if they can, then I can only tell you that IME, it ain't necessarily so. While the mithral chain shirt is a great buy, many character don't purchase it for a variety of reasons. Ask the druid and the low-ST wizard, for example. You may as well complain that certain spells are overused...and you'd be right. But that's part of the game as designed. It's assumed that the average character will purchase a bag of holding, for example.
The problem with the 'starting wealth of 7th level character' theory, is that you have to do two things: first, generate the character at that level and spend the lump sum of gold, and two, have ready access to said material and items. A character created as a 7th-level character and given the starting wealth can do this...but a character who has clawed his way up from 1st-level likely won't...unless all of his treasure is in cash, and no found items (remembering that the wealth levels so listed are including the value of magic items they should have found or made by that point).
Also, there are a few items on the list that are clearly underpriced. These include the Keen and Energy enchantments, the Boots of Striding & Leaping, the Mithril Shirt, and the Eyes of the Eagle. (Oh, and Heward's Haversack -- especially if it allows you to draw an item from it as a free action.)
The Boots of Striding and Springing were errated. At their new price, they're still worth it...but not really that unbalancing. Considering the keen and energy enchantments need to be layered on top of a +1 enchantment, they're not that amazingly cheap. The haversack was a good item, regardless. Look at the iconics...they ALL get one by 10th level. And so does everyone else, usually. You may argue that this is exactly the problem. In which case we'll just have to disagree.
It sounds like you don't like the prolifieration of magic items within the game in general. This is certainly a valid taste issue, but more within the purview of the DM to control. Furthermore, given that by 7th level, the mage can make a weapon a keen, flaming +2 item every day, the relative cost of those items isn't really that crazy, either. The main difference is the cost in spell slots and prep time, as well as the fact that it can be dispelled as opposed to temporarily suppressed.
All in all, while I understand your dissatisfaction, I think you paint with too broad a brush. There are legitimate reasons to use these items, the same way as a fighter will choose to use a weapon and a cleric or wizard will use spells. A fighter who specializes in archery will eventually get a mighty longbow. That's simply the reality of the game. Choosing specific magic items is little different at the mathematics level than that, it's just a difference in flavor.