15 muni would be about right. A 30 muni trade for whatever the targeted model's MP reinforce is, wouldn't offer any reward whatsoever. I mean, nades are 30 muni and have the potential to wipe a squad. This is just targeting a single model.
First of all a nade is somewhat a skill shoot in coh2 and this "assasinate" button of yours is just targeting ability.
Secondy, they both have potential to wipe out squads. Dropping costly units and forcing to retreat easy. Not to mention could kill snipers with a cost of 15 Amu -which is fare for you-
Lastly, which is not a direct responce to your ridiculous "whats fare" mentality. People have to stop favoring their beloved factions. Try to play all of em and If you have balance ideas about the game just say them in the name of balance not fanatism.