He's being fully serious.
3 seconds sound clip from the Guardians of the Galaxy (2014) movie soundboard.
You can hear this line at 00:47:07 in the Blu-ray version of the movie.
Quote context
[...]
- The Nova can't know what we're after.
- I can't tell if you're joking or not.
- In that case, I can show you...
- But first, you gonna tell me what this orb is, and why everybody cares so damn much about it.
- And then you gonna tell me, who out there might wanna buy it.
- Sir, the high-end community is a...
[...]