From accumulating WOF spins I have also noticed that lottery tickets are a bit more common in practice, though not sure if it has been mere bad luck the 3~4 times I have exchanged batches of WOF spins (500~1000 at a time).
The chances of winning 50 reward points, 50 satoshi and 50 lottery tickets prizes are each 32.93%.
The chances of winning 500 reward points and 500 satoshi are each 0.2%, but the chance of winning 500 lottery tickets is 0.3%.
The chances of winning 5000 reward points and 5000 satoshi are each 0.1%, but the chance of winning 5000 lottery tickets is 0.2%.
Therefore, it's expected to win more lottery tickets than reward points and satoshis.