Vondi - I only mine CAT on Coinium and there is nothing in my account or in any of my transactions that show a fee - only my donation percentage.  Can you provide a screen shot or link that shows a pool fee for CAT please?

edit...
Found it - "my account", "dashboard", left side half way down "account information" and I agree.  The full list of fees is also here:
http://www.coinium.org/poolmanager/

That's why I asked for additional information - It saves us all a lot of time.

I'll send it to Maverick to update the OP.