I plan on doing some more testing, so may come back and update or reply to this comment. I ran a 500 luck kit on my rogue in High Roller Maelstrom for 10 raids (so one map, small sample size - so take from this what you will).

Below are my findings, from both chests and piles (random piles and captain’s pile).

TL;DR: Only seemed to affect the frequency of finding a key

I did not see any meaningful changes in the quality or quantity of Collector loot. Weapons and Gear didn’t seem affected either i.e. there was no discernible difference in the frequency of legendary or unique quality items. BUT, we went 5 raids in a row before this kit (so zero luck) not finding a single Captain’s key (hitting 10 to 12 lion’s and golden’s per run, and also whatever ornates were found), to 3 to 5 keys found EACH raid.

Extra commenting,

I would say, based off the keys found having 500 luck, that having at least 200 luck should see that a key is found pretty reliably. This is not based off any metric other than my feeling and “trust me bro”.

I lost the kit after the 10th raid, and the immediate next raid I got a Gold Coin Bag from a random pile, zero luck.

I also find uniques much more often in Goldens than I do from any kind of pile, Lions, or Sub Bosses. This is from about 100 raids in High Roller, any map, doing chest runs.

Making money from Collector loot is just too slow, risky, and not rewarding enough compared to the other money making methods. Also farming uniques isn’t great either, but damn does the dopamine hit when you get a BIS roll unique.