This is absolutely not the case. The randomness in damage comes from a wide variety of sources on WBR, especially from runes and other mechanics which increase damage but have things which may prevent you from getting their full effect, particularly the boss’ unique mechanics which aren’t at set timed intervals.
Boruta operates the same as any other damage increase card–you can easily see the difference in damage on a boss with a monster type where another card exists (beasts, for example) and compare the damage difference between using a Boruta and, say, a Panto.
It’s extremely easy to blame the reason you don’t rank well on a singular item that you believe other people have and you don’t. A Boruta card is not going to add billions of damage unless you’re already doing many billions of damage (and probably not going to add that much anyway)–this means you actually have to have some base knowledge about how to do your rotation and understand what’s contributing to your damage.
I can tell you the drop rate is extremely low–people can see loot drops on things like Panto cards to see how bad the rate is. I think we’ve gotten 4 total cards in the 1.5 years since they changed the way cubes/Boruta loot works. I guess I’ll say we’ve averaged rank 2 for much of that time. For us to get that number of cards in that time explains their cost elegantly–if someone even has the audacity to sell one. On the other hand, they were in a Leticia’s cube once and the price came way down, so there’s that.
You could also join a guild with a leader you trust to not be a loser. But back to the topic at hand…
The increase in your damage when it comes to ark vs. accessories is going to come down to your current level of gear and what your current ark level is.
Punishment was a massive increase for me, effectively doubled my damage in WBR. This is over strength ark at level 5 at the time. However, I did my karas first because I’m running appraiser. If you already have karas, I’d argue that punishment is a bigger DPS increase than Luci but Luci is a very noticeable upgrade as well.
I would do punishment to level 7 or so, then Luci, then finish ark leveling.