I haven't experienced click fraud on Admoda. You could check your CTR% from inside the interface to see if it is abnormally high.
I suppose referrer agents and the rest could be faked (although unlikely) but are they smart/care enough to fake a normal CTR%? I doubt so.
Also amayne could you add me on skype at tomdigitaluk I wanted to talk to you about the post you made regarding InMobi ad reps. Cheers!