I saw the latest feature of freebitcoin yesterday, yes I think I can immediately exchange all the RP owned into WoF but only 1 exchange per day with a value of 43 RP, but I think it would be a waste of RP owned if the results of WoF are just lottery tickets, and I won't to waste my RP so I will prefer to keep and collecting more to reach 100K and exchange to satoshi.
Maybe it is not worth the effort if your limit is 1 wof exchange per day but statistically per every 1000 spins you are expected to win the max RP and max sats rewards once each. In the long run you are getting a relatively higher profit compared to just exchanging RP directly to sats although it's probably not the most ideal way to cash out a large amount of RP.