The same reason they did in LR, they probably think the season passes are a reflection of the general price of the DLCs, that and we can't really get individual costumes like we could in LR without buying tickets so the only other option is buying full packs which is somewhat pricey too
Free Step Dodge
KasumiLover
Onryoki
Because they have nothing else to bitch about. People tend to forget that the DLC is available INDIVIDUALLY.
Force_of_Nature
@KasumiLover Indeed. It just boggles my mind when people keep acting like the season passes are some sort of mandatory purchase when you play DOA6. I've never needed to purchase a SP to get the content I want. Don't get me wrong, I loathe SP's and hate their existence, but choose to avoid them as opposed to act stupid regarding them.