MOM - $74 Million (Satellite, Indian ground stations and software upgrades) (15kg payload)
MAVEN - $671 Million (Mars Scout program which MAVEN is part of) (65kg payload)
MOM is a demo unit for India that included a science payload. MAVEN was built to collect Mars specific data as its primary function. Service life and scientific instruments are also rolled up into the cost of each.
Both are of value to science for different reasons and their cost reflects that.
I'm happy that money is being spent on expanding knowledge rather than regional/global conflict for a change.
Biting the hand that feeds IT
