Dont take too much time on this
The
odds of winning big on this are not good so have fun as its free but best to concentrate on your game than spinning
roulette wheels.
When they run the freeroll of $5000 or $10000 they often splurge many thousand tickets through the system so your odds of getting a ticket are much higher and very likely.
However I played these for 3 years and the most I won was a freeroll entry to the $10000 which attracts as as many players so the odds are not great but its free.
Still for $5 you could get direct entry to a $10000 tourn with a much lower player turn out so higher odds for you to enjoy.
Enjoy but focus on your skill set not on chancy games.
You never know the jackpot awaits just dont focus on these too much look at your skills instead.