The prizes aren't random, they're tied to specific stamps.

I'll definitely check with a programmer about the notification. There should be one, so I'll make sure that gets situated if it's not working.

And just so you know, the middle stamps (the small ones) are just marker stamps, you only get things on the big stamps :)

Every single stamp doesn't have a prize. You didn't get your second prize stamp yet! Everyone gets the exact same prizes at the exact same levels.

Also: The event is fixed :)!

Yeah, that's what must have happened!

The prize levels for future cards may vary. There are currently 6 stamps that give prizes of the 10. It's just your place in line, you're currently 2/10 from what you're telling me, right? That level is keeping track so you know how many increments of $10 you've purchased.

Locking it up, hope this cleared everything up!