Changing between wallets doesn't mean that the money is actually changing hands.
Most of it seems to be just trade volume on MtGox, not actual transactions recorded in the blockchain.
Deposits and withdraws of Bitcoin will show, but all trades within MtGox are not recorded in the blockchain. It's just Gox moving balances between accounts.
That was exactly my point. Most of the bubbles on the screen on MtGox trades, not blockchain transactions.
He means Gox moving balances between internal Gox accounts, like hot/cold wallets. Not trades. The trades you and I make on Gox don't show on the blockchain until they're withdrawn.
Change from outgoing MtGox payments does show up in the blockchain, though, and it tends to be relatively large compared to the actual size of the payments. By design there's no reliable way to tell the difference between change and the actual payment either.
Reaping mining rewards? Cashing out on Bitcoin which they bought when it was cheap?
not possible
Care to explain why not? What stops someone who mined 10k bitcoins in 2007/8 from cashing out. If I remember correctly, there was a guy recently on #startups freenode who showed everyone a screenshot of his wallet at $800k[1] (one sec let me find it in my history) and claimed he mined them all really early.
They are definitely a handful of people who have over 10k bitcoins, but they're not storing it on an online blockchain.info wallet (which is where that screenshot is from). They're also not showing it on IRC.
That kind of screenshot can easily be produced by changing a little HTML on a 0 balance account.