Whenever you sell or buy things doesn't really matter as those things such as map drops has value. = ability to sustain and run more maps
Making 28% qual weapon/armor has value = more defense/dps
Being able to double corrupt items or gems has value = chance for 21 gem
Upgrading breachstones = more xp better drops
White sockets = easier managing skill gems
Sirus drops like awakened gems = again more dps
Everything in maps has value. Even in SSF.
Whereas heist is just some raw currency and items drops that overall has less value.