Link exchange site allowed

I want to make an advertisement network with the following idea.

You sign up on my site, upload your banner, put some info on your site and choose category it’s in.

Then you add a code to your own websites displaying a random banner.
each time a banner shows on your site, your accounts gets a credit, each time your banner is shown on another site, you lose a credit.

My question is.
is this allowed on bplaced ?

i don’t think so.
it’s like a linklist.

It will also have a forum for discussion.
and you can use virtual cash in the forum to get extra things like text links etc…

A demo of what i’m going to use.
it’s not an automated site.
there is going to be user interaction to it.