Lower bids, slightly higher buyouts – why?

This may reveal me to be a complete noob, but I’m curious:

Why do some people list consumable items on the Auction House with starting bids that are lower than buyout prices?

By “consumable items,” I’m referring to anything that is a ”use once and it’s gone” good.  These items include gems, enchants, food/flasks/potions, belt buckles, and raw materials – you buy it, you use it, and you buy more when you need more.  In contrast, there are gear pieces, weapons, rare mounts/pets, and other hard-to-get items, but I’m not talking about these types of things in this post.

(Or something.)

For the past several months, I’ve made the bulk of my money from gem sales.  That’s not all that I’ve sold, but it represents the majority of my income.

I find it odd, though, when I see gems listed at “bid: 66g 99s 99c, buyout: 68g 99s 99c” with six of them listed, all in a row.  I see this all the time.

As a buyer, I can’t imagine looking at that listing and saying to myself, “Well, well. I think I might just place a bid on one of these gems!”

Generally, if a player needs a gem, he or she simply buys the gem that has the lowest buyout.  Such a player is not going to “wait, and hope” that his bid will win.  After all, the AH lists all of the same items in order from lowest buyout to highest by default.  Due to several factors – the abundance of gold in the game (relative to prices), the fact that these items are not necessarily rare (they can be produced all day as long as there are raw materials available), and the fact that the player usually plans to use the item right away – the lower bid price seems superfluous to me.

If someone is selling the Reins of Poseidus, I understand having a lower bid value.  But for consumable goods, I don’t.

As I said at the beginning of this post, I’m not an AH expert.  I’m a smart guy, and I have more than enough gold at this point (and the confidence that I can make plenty more), but I don’t play a pro AH game by any stretch of the imagination.  So perhaps I’m missing something obvious.

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Thanks for reading this post by Mushan at Mushan, Etc.  Comments are welcome!