Playing the FB pin

I've been watching the "pin" action on FB for weeks and weeks and weeks. I tell you, these market makers are good! It's not 100% of the time, but more times than not these guys pin this stock on the strike with the highest open interest. And I mean, to the PENNY! 

Tomorrow is the June monthly expiration, and what do you know FB has the highest OI at the 65 strike. So with that information I'm playing a 64.50/64 put spread expiring tomorrow. I collected $120 of premium on 10 contracts after commissions. My max loss on this trade is $380.