Just an idea, but i was wondering if the artefacts could have a "pseudo-random" value (>=3 & <=7) upon scanning and showing the picture of it; The average would be 5 so, but being lucky or not could change the flow of your updating etc... (and the search for artefacts would be more interesting, less linear etc... players would think "maybe i found a good one this time?!". Finally, "adding points" to the total should feel like "science/discovery", more than "unlocking with a block". Could be nice! ʕ•ɷ•ʔ ).
Something like this maybe for pseudo-randomness:
[ 3pts=>10% 4pts=>20% 5pts=>40% 6pts=>20% 7pts=>10% ]
(to counter-balance too much luck or misery lol) Just to add some spices to all that, and to justify "scanning" the moony thingy! ʕ￫ᴥ￩ʔ