I know, I always wondered that. ;p For example are 9m while a costume trunk at a decent price should be at around 7.5m currently. What's even crazier is that the price seems to be steady at that price, so it makes me wonder, do people actually buy it for that?

Well... yes that is strange but it happens. The price will drop but then skyrocket again when the DPs finally retire for the month.
What you are saying makes so much sense, but some people just do not realize that there are cheaper outlets or even more logical ones. xD
It's because people are greedy and like to try to rip off those who don't know any better. :)
and there's people'll get a certain trunk or something and say that's it's 20mill when it's really worth whatever the price of csc or a MCT.
[img align=right]http://i34.photobucket.com/albums/d141/666StJimmyismine666/weresafefornow.png[/img]
The MCT items being more expensive that MCTs is because some items are the only really desirable ones in a less popular trunk, so most people don't want to get the trunk and have to sell the rest of the cheap items just to get the one, and eventually that causes the price of the one good item to fluctuate.
And as for the Ink Dipped Needle, most people probably chose another, more desirable item in the SP so there's not too many in circulation. Honestly, I'm not too bothered by these things--I mean, as long as you do your research, it's not like you're going to get ripped off. Just buy the less expensive item, no big deal.
The issue that brought up in the only one that irks me too. It's ridiculous.
Ugh, I hate that. I had such a problem getting my hands on a before they retired because nobody would sell one to me for less than 7 or 8 million sP, when you could obtain the entire costume trunk for that same price. Thing was, I didn't want the rest of the trunk, I only wanted the Pooch. :(
In the end I actually had to buy a MCT just to get the Pooch alone. - . -