Good winnings. I also posted my huge winnings few days back and was looking for how lucky people. I think freebitcoin takes care of everyone now and then. 
Good for use.

Well, initially I have played every satoshi on the multiply btc game so that I can increase my base free bet. If you look at the free roll page closely then you have to either wager, buy tickets, so that you can have extra bonus in base bet.

It's healthy that you should keep playing with your Satoshi rather than keeping them in the stealth mode.

Since the time they have added WOF the earnings are boosted. So yeah, better to keep them trading and increasing it.