Why should I go Low-STR? Convince me.

Three advantages of STR bandits are that

1. They have Faster speed daggers
2. They have a higher base damage rage resulting in more "stable" damage
3. Khanjars, and dragon khanjars (In fact I kno someone with a 28 atk dragon khanjar oO godly)

I guess it really depends on if you're able to get a STR dagger that is better than your blood dagger, and able to get your hands on a khanjar/dragon khanjar.

Higher base damage is only in the later levels when the amount of damage gained from att outweighs the luk advantage LUK Shadowers have. LUK adds more to both Min and Max damage than STR does.

Assuming we're talking about late levels (150+), STR will eventually win out because of their weapons having a higher range and the fact that once HT pendants can be fully scrolled, you'll have an entire 73 STR from your Pendant, 15 from your helm, and 4 base, resulting in 83 STR, more than even the Timeless daggers will require.

17 LUK (Which is equivalent to about 4~5 ATK)

17 LUK is about 3-4 att, unless you have insane amounts of Att and relatively low LUK.