Is it really a good idea? It seems you are losing money on long term by doing this. Each WOF costs 50 RPs, but you will earn lots of lottery tickets from those purchased WOFs, what means you can't recover the investment in 1:1. Theoretically to make it worth, you had to receive every base prizes in satoshis or RPs.

Meanwhile, if you save 100,000 RPs, you can swap it into satoshis in the 1:1 proportion, receiving 100,000 satoshis then. It takes longer, but you are maximizing the potential of your RPs.