or being held by someone who's going to flush the market down the can
You gotta get some perspective man. 30K coins is by no means gonna "flush" anything.
30K is the avergae volume that's being traded on the exchange market
every 6 hours. Really, people somehow seem to think the FBI now owns 50% of all traded coins or something. Get real. They own about 0.25%, and even IF they were to dump it all at once on a single exchange (which they won't, assuming even the FBI is not completely retarded, but for argument's sake let's suppose they will) then the price would just very shortly drop there, and bounce right back again.
Actually a 30k dump all at once at current prices would drop btc's price down to about $500. While I agree with you that people would just buy back in and the price would eventually rebound... a drop of $300+ dollars in a matter of seconds is huge and would likely lead to some serious panic selling at first that would drive the price down further.
It's not true that the price would drop only a little if that many coins were unloaded on an exchange at once.