It's a contest, If "stake" gives to all people you also will receive the small money too + the high roller doesn't like it a small reward while they're on the top wagering. My suggestion, don't chase the wagering contest ~XD because is too high a wager amount.
You can wager $100,000 in Stake, risk $1,000 about 1000 times like this:
Just to be rewarded "at the moment" with $20.
See who you're competing with:
These guys wagered millions, truly millions of dollars.
Even if you wagered $100k which is a lot for the average Joe - how can you compete with those who wager millions?
They have thousands of tickets for the Xmas giveaway, thousands - you have just a few - so who has more chances to win?
Again - if that's how they like to do it - no problem, no doubts those high rollers like these are the milestones Stake needs, but if you're thinking of winning something massive in the race or get a better fair chance to win the Xmas raffle? Don't be so sure about that.