Might I propose a not-so-radical solution that can actually be accomplished without the intervention of staff?
We need to report the OP of spam megathreads in bitcoin discussion while hilariousandco needs to trust our assessment and nuke the thread.
Once enough threads are nuked the shitposters will miss their sig campaign quotas and not get paid.
And once they don't get paid enough times they will quit joining campaigns.
There will inevitably be some butthurt from legitimate posters, especially those who participated in the first few pages of a thread, but think of this as short-term pain for long-term gain.
EDIT - I've reported one thread in bitcoin discussion as a test case - "What if Government bans Bitcoins?" [sic] - which I've quoted the OP in case the thread is, indeed, nuked:
Looking at the decentralized nature of crypto-currencies,Wonder if govt bans Bitcoins in future??Is it possible let's say by blocking all sites which relate to Bitcoin wallets/payments etc over the internet.In that case what would happen to our existing coins held in those wallets??