I’m a bit unsure why they want to change gameplay based on the value of the ad.
It’s not like I get sucked into the game and decides to watch more expensive ads (which is the mechanic of golden berries or whatever)
As far as I understand the rule, high value players are more likely to die - but why?
They want to ensure you watch it.
If you tend to watch ads and have a high score then when killed it's likely you will watch the ad to revive.
I guess there’s just a lot I don’t know about this ad market. Is the high value ad only available to show for a limited time?
Very likely yes. Consider an ad for a political candidate: before a particular date it is worth a lot, after that date it is worthless.