> So... is my BTSX balance increasing daily?
No, your balance does not change. If we had "bips" (explicit dividends), then your daily rate would be the "burn rate" times your percent of the stake. We don't have that though, you just get increased % stake in the form of decreasing supply.
> I understand expenses, but wouldn't it be better to show the daily pay for ALL the delegates rather than some average per when many are used?
> the burn also feels like it would make more sense as a total daily amount rather than some average per delegate percentage.
It's not an average, it is total for the day.