You said it  

A coin designed and marketed with the exclusive purpose of providing a market valuation to the activities of market rigging.

It should have all its properties optimised for this purpose itself - developer premine dedicated to pumping, high liquidity, guaranteed volatility courtesy of scamster pot smoking, sex talking coin fleecing gangs of crypto-paracites.

All investors would qualify for automatic membership of Bob's "gang" and be provided with inside info on pumps, dumps and general attacks on other coins.

That way, even if the wider cryptocoin community wasn't invested, it would have a canary in the coalmine that "something was afoot" in the form of a sudden rise in the marketcap of Bob Surplus coin.