Or maybe activating the mission makes getting the gold easier, like if you need to
"Loot Gemini Geiger Blaster"
By excepting the mission, it lowers the amount needed so instead of 9, you just need like 5 or 6. Time wasting, yes. Rewarding, maybe.
or...
Instead of needing the full 9, you just need like 1 or 2 to complete the mission, so the mission after is
"Loot Gemini Geiger Blaster Part 2"
So you need another 2 to complete the mission, then
"Loot Gemini Geiger Blaster Part 3"
and so on. Plus, when you finally complete the full BP, the mission gives you the cryo needed to buy it. Wait, that would give you like 3k cryo lol. Still, I think that would make it better.