When your "decadent, drunken treasure hunters" letter made its rounds pretty much everyone in Thalmarkin was like "Yup, that's us alright."
This.
And therefore, this:
"we are bored so we will loot you"
Actually, I'd be kinda happy he didn't pull out a serious reason... Makes the likelihood we stay in this for a long time lower while also granting the possibility that we'll just choose another random target. Or hey, maybe we could alternate between Rio and Nothoi?