Dragon Bash Survival: Rewards Beyond Ten Rounds?

Was late to the party last night, so I only got a few hours in before having to go to bed. In that time, I did the Lifelike achievements and the boss slayer achievement 5x (forgot what it's called).

Then I entered survival with a motley crew of PUGs of various levels of humor, and we completed the ten-stacked Eye for the achievement. But the scale didn't stop there. Was only able to take him to fifteen before we all got tired.

Out of curiosity, do you get increasing rewards/ extra coffers/ hidden achievements the higher you go, or is it pointless beyond ten? I mean... we got to fifteen, so I'm probably answering my own question, but I have a feeling someone out there was bored enough to yolo it out so that I wont have to!

My guild group got Eye Survived last night. However, I noticed that towards the end I was only getting 44 copper as a reward for killing bosses. No more coffers or anything else, so that tells me that there is a cap, but I don't know if my previous coffers outside the instance added to that cap.

There is definitely an account wide cap on the number of coffers you can get from the events. You still can get the "achievement" coffers for beating all the bosses, but individual bosses cease after about 10-15.