25% luck and 30% loot elixir query

[Hiosahaf]

I had a question regarding the drop specifics of both the elixirs.

So the 25% luck lix makes me re-roll for a item BETTER than I was going to get originally (Still dunno why greens are re-rolled though). Does the same thing apply to the 30% loot elixir?

And what is classified under loot? Are crates classified under this section? I think they should be coz technically it still is a 'loot'. Anyways, if they are, what is the difference in the TYPE (except the percentage of course) of these elixirs?

Thanks in advance for your answers!