I never discovered a correlation between scores and sales in the past. My items with a 9.5- 9.9 don´t sell at all on CGT, not once.
Also, my texture packs (another account) have a score of 4.9 or 5.0..... because no meshes in hundreds of formats and no native file is included, because... they are textures.
So, scores are totally overestimated and do not follow rationality (see the textures example above) . What counts are sales only.