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The tyranids wargear list states that models with a toxin sack causes 1 additional damage on wound rolls of 6+ in the fight phase

What that mean:

a) all weapons wielded have +1 on their damage profile for wound rolls of 6+?
b) an extra wound is inflicted that deals 1 damage (with normal saves allowed)?
c) 1 damage is inflicted with no save possible? (Since only FnP-like rolls can prevent damage)

A is the answer. 1 damage becomes 2, 3 becomes 4, d3 becomes d3+1. etc.

Actually, Toxin Sacs specifically state that on a to wound roll of 6 the attack has damage 2, given that damage is it's own stat there is no possible room for interpretation here without a massive reading comprehension failure.

This does also mean that Toxin Sacs on monsters are completely useless, why sacrifice damage D3 or D6 for a 2 on a to wound roll of 6.

 Imateria wrote:
Actually, Toxin Sacs specifically state that on a to wound roll of 6 the attack has damage 2, given that damage is it's own stat there is no possible room for interpretation here without a massive reading comprehension failure.

This does also mean that Toxin Sacs on monsters are completely useless, why sacrifice damage D3 or D6 for a 2 on a to wound roll of 6.

I recommend re-reading the rules for toxin sacs, you seem to suffering from "massive reading comprehension failure". It says "1 additional damage", not "2 damage flat".

"...cause 1 additional damage."

That is not "2 flat" and isn't useless on big gribblies. Roll to hit, to wound, any sixes to Wound do +1 damage after saves are made. Simples.