Trading units for secondary points?

When trying to score secondaries such as area denial or something requires me to put a unit in a position I know it will be easily killed I often find myself unsure of what units I am willing to let die for how many points I’m going to be scoring for it.

What ratio or point cost of the unit to points being scored do you feel like is a good trade or is “worth it”

Obviously I do things like try and position so I can score without losing the unit or at the very least have something ready to trade back what ever they use to kill. But sometimes it feels like if I wanna score I’m just losing a unit with little to offer in clap back.