In Ratdom, the ward says "thank you a thousand times". I tested if he really does, and if so, if he just stops at 1.000, if it continues, and whether there is a special remark or achievement or other easter egg associated with it.
So, he does end up in a loop, and yes you can make him say thank you 1.000 times, and more.
But there's nothing happening at or after 1.000.
Now, I think that's kind of a shame. If someone actually goes through the length to listen to 1.000 thank yous, there should be a little reward
How about just adding another achievement into your book, that you actually did listen to someone saying thank you 1.000 times, or having received 1.000 thank yous for a supportive deed
Or, maybe after 1.000, at the 1.001st reply, have the ward say "Nope, that's it. Just 1.000".
And maybe simewhere in the middle "Do you keep count?"
