Assume for a moment that AMC, Bitfunder and Weex are in it together, WEEX was the trap, AMC the lure:

• Put together a good story for an mining asset - the next AM. Heaps of people buy in on Bitfunder
• Close the BF/Weex exchanges (with a similar non reason like BTCT.CO) and stop everyone trading the shares.
• Ukyo comes up with a non story about "the coins are gone"
• Dump another round of shares onto another exchange (take more coins). We can blame Ken/AMC for a loss of some BF/Ukyo/Weex money.
• The scammers involved bugger off to a nice island with thousands of easy to smuggle bitcoins leaving behind a couple of battered forum accounts and an empty garage (after selling the workbenches).

 

Maybe more complex than most scams to try make it harder to spot?   Happy to be proven wrong of course, this just a conjecture for the conspiracy minded..