Yes and no. When you're playing a game you expect it to acknowledge you're doing the right thing, even if you're doing it for yourself. It's a gaming thing, one of those subconscious mechanisms that make games tick.
Each game has its own mechanisms of acknowledgement. One of the most prominent ones in this game is credit rewards (others could be praise in flavor text, reputation rewards, boosting a faction's influence, satisfying explosions...). If you do what you think is right (explore extensively in this case), you come home to sell the data feeling satisfied about your achievement, and then it turns out you lost money in the transaction. That feels as if the game was punishing you. Is not that much about the money, but about the game acknowledging your actions as appropriate. You might feel rewarded by the exploration itself, but if the game takes money from you for it, it's telling you that you should not feel successful.
Same with every mechanic. That's why balancing is so important in games like these.