I have to admit, that's a pet peeve of mine too regarding bought packs with expressions etc

I spose one is able to contact the merchant or marketplace help forum and ask to have the pack corrected however its usually more time consuming getting something done about it than the tedious task of just editing the files yourself; you purchase something coz you want to be able to use it, not spend days messing around trying to have it fixed before its properly usable.

Whilst i do think the onus is on the merchants when producing an expression/pose pack, i do also wonder why its not picked up in product testing before its released.  Sloppy on both counts i think.