He's just a crazy guy. I transferred the coins including my 0.5 totaling 3 SYNC to Poloniex for Day trading yesterday and it's still sitting there as we speak.
I didn't pay bounties in SYNC because I know the coins are worth way more than the current price so why would I dump it when it's not even 10 BTC yet.
in actual fact, you selling those coins is neither here nor there... that premine is yours to do with what you will , and if the need to sell them to pay bounties is required, then do so. I will continue to support this coin.