Reward for completing a count of $\,30\,$: family dinner out (or equivalent)
(chooser order: Bethany, Ray, Carol)
If two days in a row are missed, the count starts back at $\,1\,$.
If only a single day is missed, we get a ‘credit’ based on the length of our current streak, as follows.
Let $\,x\,$ be the current consecutive number of days without missing.
The new count starts with $\,\text{ceiling}(x/2)\,$.
For example, suppose we go 15 days without missing, but then miss a day.
Here, $\,x = 15\,$; the new count starts with $\,\text{ceiling}(15/2) = \text{ceiling}(7.5) = 8\,$.
INTRODUCTORY SPECIAL:
To jump-start the new system,
the first reward will be earned when the count is TEN!