I saved the first 50 roulette tickets (6 or 7 expired, I didn't realize they expired), Then I rolled the remaining ones. I have won 1 nice car, a few mediocre ones, and iirc 30k instead of 5k or 10k only ONCE.  All other times it is lowest value prize.  One engine, btw. a handful of parts.  But instances of getting the best prize in the group, it is not more than 1 out of 50.  More than 50, since I've rolled prob 20 more since the initial group.  
I'll keep meticulous records in the future, when my office, desk, & computer get put back together.