Could you please clarify?
I would like to discuss this rationally, but am having trouble parsing that.
Each point of average damage is worth 1

.
Life creatures all have a -1

discount to cost.
The skill on the rustler is less valuable than normal because you cannot rely on getting a rustler.
So the value of
A Rustler result is 0

+ 1card
An Adrenal Rustler result is 3

+ 1card or perhaps 2

+ 1card if the multiple turns sidenote acts like a debuff.
Dilution cards are based off the average value.
Cost: 1

+ 1card = 50% value of option 1 + 50% value of option 2
If Adrenal Rustler is valued at 3

+1card and the other option is valued at 0

+1card then the average value would be 1.5

+1card which would round up to 2

not 1

.
If Adrenal Rustler is valued at 2

+1card and the other option is valued at 0

+1card then the average value would be 1

+1card which is the current cost.