Yes, and here are some examples that may help AGORA answer your questions:

http://agoracom.com/members?message_id=1520543

Note one has been banned the other three are still active

4 Members Found

BLunist Mail Room (102) Votes: 34 Score: 3.1 Currently 3.2/5 Stars.

blunist12 Mail Room (5) Votes: 1 Score: 1.0 Currently 1.0/5 Stars.

BLunist13 Mail Room (21) Votes: 3 Score: 2.3 Currently 2.3/5 Stars.

BLunist11 Mail Room (59) Votes: 5 Score: 2.2 Currently 2.2/5 Stars.

About the IP Check Tool

Here are two more examples (although the argument could be made they are really different people):

http://agoracom.com/members?message_id=1396961

2 Members Found

IP Check Results

Message: a note from RP

coolfool Mail Room (18) Votes: 10 Score: 3.0 Currently 3.0/5 Stars.

northtocool Mail Room (81) Votes: 8 Score: 3.3 Currently 3.4/5 Stars.

http://agoracom.com/members?message_id=1403384

Does this mean that since coolfool is in both but they're not all together that dynamic or different IP's were used? I guess it could be that he just traveled where others were members here too.

Message: Re: jef, Rich, OBW...all excellent comments...this is from sman998

coolfool Mail Room (18) Votes: 10 Score: 3.0 Currently 3.0/5 Stars.

rocker Mail Room (112) Votes: 7 Score: 2.4 Currently 2.4/5 Stars.

Finally an example where the poster admits who they are (there are more than just several of these and no reasonable doubt can be had as to who they are) and are connected with no previously used IP.

The content of R here again(?)'s post is:

"I have muliple personality disorder and none of the other me like this me! LOL"

and he identifies himself on another board as Paul.

http://agoracom.com/members?message_id=1396665

rherrgen Mail Room (58) Votes: 6 Score: 1.0 Currently 1.0/5 Stars.