Right. They decreased the chance of winning big prizes.
For example, the chance of winning 500 satoshi was 2% and the chance of winning 5000 satoshi was 1.3%, but now they are 0.2% and 0.1%, respectively.
For more details, you can read
the post I made about this before.
Thanks for the link, somehow I didn't saw table with exact numbers after they decreased chances to win something. And damn, these changes is very significant and nothing surprising that getting something significant is very rare thing.
Back when they introduced WOF these high rewards were so attractive, but as usual, good things doesn't lasts long.