> history. Lots of miners have dropped out due to hardware obsolescence, yet
> massive double spending hasn't happened.

How many thousands of BTC must be stolen by miners before you'd agree
that it has, in fact, happened?
(https://bitcointalk.org/index.php?topic=321630.0)

Hmm. I think this is a disagreement over the term massive. I was meaning we don't see double spending like we see carding fraud in the traditional online payments world. We can talk about Finney attacks by linking to specific discussions of specific events, because they are very rare, which is why merchants generally ignore the possibility. I didn't mean the numeric value of lost coins added up so far.