BUT BP1 also grants access to pgrens and progresses tech as well as unlocking lmg42s, so it's not a flat cost for the rifle nades and can't easily be used to accurately inflate the cost of grens. At most we can attribute 1/4 the cost of BP1 into nades, so 25mp and 10 fuel, still putting them under for cost compared to cons. However I do not believe that ost teching should be considered into the cost of grens as it will be done and paid regardless if you use 5 gren squads or none, in contrast to conscript upgrades that serve no purpose if you don't build any cons and could be deemed cost ineffecient if you only build 1 or even 2.
I don't think it's fair to include the mobilize reserves unlock cost as it's an opportunity cost that can be mitigated via a full tech, so paying for it is a choice that shouldn't be included in considering their "price"
I have simply provided stats and made the observation that conscript "spam" is more viable than gren "spam".
Feel free to include what ever cost you like but that will not make grenadiers cheaper then conscripts or more viable to spam.