Yup, hitting 5k doesn't happen very often, I've never made it yet, got quite a few of 500 wins though.
Your expectations were set pretty high, with 5k tickets you only had like ~0.025% chance of winning any prize (if my quick calculation is correct).



There are thousands of participants with low amount of tickets every week, so it's no surprise that one or few of them will happen to win something in every round.
And it's not like they've won any life-changing amounts. You can probably earn more in your signature campaign with few posts.