The pricing makes little sense at either the level of being representative of the value to humanity or a way of scoring explorers.
For "value to humanity" pricing stars based on rarity makes sense, but that model isn't followed. It seems obvious that there is good money for ELWs, terraformables etc. However these need to be weighted so accessibility becomes valued (i.e. an ELW near to Sol is more valuable than one 30kly away.
Value for mineral deposits is another angle. Worlds that are primarily for extraction (metal rich) don't feel like they are inherently more valuable than say a GG with Metallic rings. Again, the viability of the deposit for exploitation matters.
However, because a lot of this is about scoring to measure what an "Elite" explorer is, I'd like to see more reward for finding unusual stuff and stuff that is hard or boring to get - so more reward for things a long way away in ly and in ls (going 500,000ls for a icy planet should be rewarded IMO). Rewards for completing systems (i.e. a reward for scanning the last body).
You know Im thinking the explorer ranking needs to be a measurement of both raw profit earned (after a balance pass) AND distance/rare bodies/thoroughness. We could use some exploration missions as well that would count towards the ranking.