Steam: Only 30 people?

You don't. Just have to be lucky on the winning team

Wrong!
The contest rules state that the 30 users are selected at random, meaning the amount of badges you craft or the amount of money you spend doesn't matter.

What? No...

I'm pretty sure that if you contribute 1 point to the team-thing, you get the same chance at winning as those that contributed 100 points.

I don't think it's tied to your steam level, how many games you own or even how much points you contributed to your team's victory. All that matters is that you're in the winning team at the end of the day and crafted at least one badge. But yeah, how many steam accounts are there? The chances that you meet the conditions above and get lucky are close to zero, no matter if it's 30 or 90 people who win.

Or sell some of your many cards and buy the ones needed to create a single badge.

it's like playing lottery. Just that a badge costs you less than a lottery ticket. But then of course half a million in cash is also a much nicer prize than 3 games. The chances to win either are both very small.

SO DAMN TRUE

They are funding our games

The cards are selling instantly so we won't have a shortage of buyers...