I have decided to pay 4500 reward points for 5WOF spins per free roll and I managed to collect 95 WOF spins. And I am glad I did it! My result is better than the one from https://bitcointalk.org/index.php?topic=320959.msg58726223#msg58726223
(of course it depends what is the real value of Golden Ticket for you...)
I get my Reward Points back + BTC + lottery tickets...