I dont want to start a flame war, see my post on "minimum value" in case.
speaking of "cost to farm tokens
at "normal" setup you get 1 box and 2 token every 100 ped shot (this is including daily missions bonus)
stripping box there is residual of 98.5 so a token self farmed with a return of about 97
99% is shrapnels so there is also a nice 0.4%...0.8% of recycle and almost ZERO MU apart about 140% for Output Amps that is less than 0.2% impact
a token cost to the farmer 0.3 to 0.70 PED depending on setup.
a rare is calculated as "value of luck" and consensus seems 5.000 / 6.000
as per my experience i have not shot much in mayehm, with about 500.000 ped cycled i got none