Luck contradiction

If the first 10 points of luck are non-existent and do not contribute to anything, how can we also say that losing 10 luck loses 2 critical? Last I checked, Mabinogi does not allow for negative stat values.

These statements cannot both be correct. I have observed that for OTHER stats, such as intelligence 10 points are not counted, but I have also observed inconsistencies with strength and maximum damage, as well as luck+will and critical (taking skills into account obviously).

10 Luck can easily be deducted from the luck you have through skills and what not. That's my guess anyways.

Luck is a weird stat in that the first 10 still get accounted for when gathering for bonuses and stuff...

I'm not sure about negative critical, but saying Mabinogi does not allow negative stat values is not true. You can have negative magic attack or negative magic protection if naked and int is below 10. Same is true for Magic Defense if will is below 10, and Defense if str is below 10 and you did not rank Defense.

On a semi-related note. Through testing of something that shall not be named (no not a certain hack we all know and hate), it is found that if your stat goes too high or too low, it becomes negative. (Yes too high.)