Why couldnt you just increment the value of the field up or down in the database after its created?
Say you create the new PropertyDefinition and the PropertyDefinitionID is 31 for arguments sake, you would create a stored procedure which would do a select of where username is "userID" and Propertydefinition ID is 31, then put that value in a variable, increment it by one then do an update back into that field with the new value.

For decrementing you may want to do a seperate stored procedure.

You would then need to call these stored procedures from wherever your user is clicking. I assume you are developing a custom module and will have this Karma button?

That's very easy to accomplish.

UserInfo objUserInfo = UserController.GetCurrentUserInfo();
if (objUserInfo != null)
            {
    //here is how to get property
    ProfilePropertyDefinition ppd = objUserInfo.Profile.GetProperty("KarmaPoints");
            if(ppd != null)
            {
                myKarmaControl.Text  = ppd.PropertyValue;
            }

            //here is how to set property
           objUserInfo.Profile.SetProfileProperty("KarmaPoints", myKarmaControl.Text);
            }

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Ash Prasad
Director of Engineering
DNN Corp.