That is of course with the SUCCESS_RATE being defined by the aforementioned formula, and the 'main_stat' actually being a formula on the stat you are using (int, dex, str depending on the tradeskill), and skill difficulty being the coefficient of difficulty for each skill.
for instance, pottery and jc are both 4s, which are the hardest. blacksmith is only a 2. you can see there is an inverse relationship as the skill difficulty is always in the denominator.
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