Ah I had no idea about the extra WoF spins! Never noticed it even when I was doing heavy wagering though, so I wonder if maybe I just did all my spins without noticing or I just did them outside of promo periods.
Maybe he was mentioning additional email you receive every day? By default it is one email per day, but I think that after you wager some amounts, you may receive more emails.
I know you can exchange RP to WoF but that's not really an additional bonus to me, and it's hard to tell if you're making or losing more since each costs 50 RP! Winning lottery tickets to me kinda lower your edge.
You are right, if you think there is 1 chance of 3 that you will get something you are not interested at all, it makes not sense to invest into it. But still it is just a game, no?
On the other hand you may always convert RPs to extra WOFs in two ways - "buying" WOFs every day or add WOFs to free rolls. But it makes sense only if you are able to execute more thank 19 freerolls /24h.