I have noticed there are seem to be a few more ads that are worth 0.025 BAT and there is even an ad or two worth 0.05 which is the highest I have seen since using Brave for over a year. Also when BAT was valued at over 1$ there were a lot more new tab page ads paying out only 0.005 BAT. Now that BAT is low I am only seeing new tab page ads worth 0.010 BAT. It ultimately comes down to what advertsiers are willing to settle to pay for their ads.