Because it shows the most snow...
The kuchera maps are ridiculous for the storm like nearly 1.5X or double 10:1 because its so frigid, esp N and W. When it's cold Kuchera will show a lot of snow. Doesn't take into account lift in the DGZ, frontogenesis or anything...strictly based on temps. I agree with the NWS and a lot of mets on here. I don't use it, it's useless imo.