How`s that? mutants 18 y.o.

[pcmacdaniel]

it's not like that
but ok, let's agree that we disagree

I agree with what Lalexrus says.

Upselling bypassed the limiting factor of the slowing down of a players growth rate as they age. Non-upsellers could still build a 340%/1% mutant (for 6* range quality), the player would just be 30 years old by the time they reached those skills, a very expensive process.

With friendly, age no longer matters.