I've just had a very bad result too: from 75 spins got only 700 and few RPs, 1200 and few tickets, 700 and few satoshis. I should have taken a print of that, but I was so frustrated that I just closed the tab.

Those bonus WOF spins looked a potential investment (besides RPs, we have also to invest time on it), but now I see it is entirely gambling.
Of course it is entirely gambling, it is a spinning wheel after all.
So far in my spins, I've been lucky and have made enough RP to cover the cost, but there can certainly be sessions where I might do a bunch of spins and things will turn out differently.