Haha, quite the opposite! But it eventually results in worrying =P
As for ATAR calculators - have you tried them? I didn't even check but i probably over estimated since i was basing it off how my subjects scaled (since i got mostly low 80) and i did sciences, advanced and stuff - so sorry about that! ATAR calculators are fairly accurate, almost impossible that all 5/6 subjects will scale considerably differently and often the differences between scaling of subjects will just offset each other.