I think you're right. No sink does mean all you can do is sell.
Yeah. I went to commentcoin's last post and sort of gathered, with my limited comprehension of German, that the "sniper" probably doesn't know anything about the dust rule.
I should really get back into learning German. It's the first language that interested me back when I got into learning other languages, but I only learned the very basic until I got interested by something else.
At least I know "Ich möchte etwas essen". You know, the important stuff.