The discussion should include the fact that bundle nades are used against larger squads. You sort of need a better nade to inflict similar manpower bleed against larger squads. If an allied squad loses 3-4 models it may transfer to similar manpower drain as 2 lost models in an axis squad.
Bundle nades are also udes against smaller squads too.
Commandos have carbon copy of bundle nades and are perfectly fine balance-wise and bundle nades are STRONGER then shock nades.
Comparing nades between allied factions (or elite infantry squads) is risky
This is 1st non stupid thing you have said since you joined .org, but we have to disregard remainer of that paragraph to keep it that way.
You don't compare these costs between factions.
You set them up internally, to work WITHIN faction they are placed and within context and specialization of the unit.
Coming back to nades. Shocks have a cheap grenade used against often 4 men squads. To inflict similar manpower bleed axis will often need a more expensive bundle with longer timer (requires both more skill and more munitions to use). IMO shock's grenade should be a bit more expensive to make sure a receiving player "accepts" the fact that they were hit by sth bigger and more expensive. There will be less/no frustration because they will know that the grenade was more expensive than the regular nade (if if the difference in price isn't too big) and won't get frustrated.
If that's the logic you want to use, PG bundle nades are also used against 4 men squads and are way too good.
Shocks fight against 5 and 6 men squads just as often as PGs do, since osttruppen and AGs are 1v1 meta and PFs are team game meta.
This is not an argument that holds any value, because its no longer vanila sov vs ost exclusively.