It's inappropriate to consider artifacts – anyone can have them, or they might not have them at all; we're looking at the raw skills.
Elven Luck with its additional 25% bonus should also be disregarded – it's a bonus from a completely different skill, not from a specific skill. In the skill tree on the first page, you can see that Elven Luck is present in all the Luck skills.

The point is that artifacts for Luck will most likely exist (and there will be more of them than for Unluck, especially compared to neutral units). It's impossible to ignore the fact that they stop being relevant.

Elven Luck is just as much a requirement for the skill as the Luck skill itself (in the standard skill tree and in yours). Therefore, it cannot be ignored. And the racial skill (of the Avenger) also cannot be ignored, especially in the endgame.

It's important to understand right away what we are evaluating: a build with a skill (and then we need to consider the skill and its requirements together, as a whole), or the contribution of the skill itself (and then we need to consider the skill in comparison with exactly the same situation, but without the skill, which means with all the requirements).