It's easier to start to look at this from the buying perspective: When you buy mats, you pay the Current Price up front, and are refunded the difference between the Last 10 Trades price.
Current Price - Last 10 Trades = Refund
So technically, you're only paying the Last 10 Trades price, but it goes through the extra math.
That being said, you can look at Current Price as being the daily average (before it actually becomes "Average Last Day Of Trades", while Last 10 Trades is obviously a more current price.
The cheapest listed mats always go first. This drops the Last 10 trades price. And as the first reply above indicates, you can make a profit by watching prices drop and fall, purchasing when the Last 10 Trade price is low, and then reselling when it rises again.
When selling mats, it's important to watch the Last 10 Trade Price to know whether or not your mats will sell. Your auctions automatically list for the Last 10 Trade Price, but sometimes you can make more profit. Your mats will sit in your auction list for an extended time if you list them for the Current Sell price (or higher) while the Last 10 Trades Price is lower. This means that people are dropping their prices to sell their mats faster. Eventually your mats may sell, but you'll be waiting for the Last 10 Trades price to match or surpass what you listed them for.
To sell mats immediately, list them for around the Last 10 Trades price (unless it's retarded low), or for higher profit, slightly lower than Current Price. Keep refreshing your searches for the mats you're trying to sell before you sell them to come up with a reasonable balance between profit and auction time.
While writing this I'm also looking at the prices of Brimstone...
Currently Price Per Unit is 39K, but after refreshing a few times, I can tell you you won't get anywhere near that. In the last few minutes I've seen the Last 10 Trade price jump between ~12K with a peak of around ~30K and it seems to be hovering occasionally between ~20-25K.
Using this info, determine what would work best for you. You could definitely sell them for 15K-20K, probably within seconds. But because both the Current Price (39K) and Average Last Day (33K) are in a higher range, you could probably make a bit more profit with a longer auction time. Listing them for 30K-35K would probably work. Though the sale might not be as immediate, your profits do increase.
I've noticed through my flipping that prices go haywire at night and even out during the morning-afternoon. So don't be discouraged if something doesn't sell right away. But if something's not selling at all, you definitely need to drop your prices.
Edited by Montus#1499 on 12/9/2012 1:36 AM PST