@Tsiguy the balance would only hit 0 if you remove your BAT. The balance is what you have in your Uphold account. I’m guessing there’s a part of you that is thinking of the old Estimated Earnings where it would show an estimate of the coming payout amount. But they got rid of that.
As to how much you get from ads, that’s all depending on how many campaigns are in your area, if you hit view limits, etc. We used to get slightly higher payouts because Brave was using a special fund to pay us to see house ads, that’s the ads about Brave products. But they no longer do that. Instead we just get the 70% of ad revenue. Meaning we get paid when Brave gets paid.
You may want to read through the two different topics I’m trying to maintain a bit with a lot of helpful information.