EBAY Newbie: Why are there listing fees?

[melissaA]

I just started selling on ebay like 2 months ago and have sold some things and all was going well. And listing items was free!

In the first month, I was only able to sell 10 items because I was new. So it got to a point where I wasn't able to list anything over the 10 items...

But then, this month, I was able to list a whole lot more (still for free). Today (I have about 40 items listed), suddenly, for listing an item, they are asking me for $0.30. Can someone please help me figure out why this is?

Did they change regulation? Or am I exeeding my listing limit?
HELP!
In response to schweppesy: Off of selling fees! Which aren't that little!! It'd be way more than enough... This is a rip-off! But, since it's a trial offer, how long did it last and why did it start all of a sudden?

[Schweppesy]

The free listing was part of a trial offer. Ebay have ALWAYS charged for listings, how do you think they make their money?

[Roddy]

eBays fees are posted on their web site. See link below.

When you go into something without fully understanding how it works you get surprises like this. Take the time to learn.