Marketing is much more complex than just spilling the beans about the product. Sometimes, you have to build up anticipation, reveal your cards slowly etc.
Sometimes, you have other goals than just selling your product. Free RPG Day is a joint venture between publishers and gaming stores. Stores benefit from the exclusive, free content being handed out, publishers benefit from hyping their products to people who might never visit publishers' sites.
Ironically, the fact that we spend time discussing the game even before it's release means most marketing effort is wasted on us, as we're likely to buy it anyway. Hence, alienating us (temporarily, at that) in favor of people visiting gaming stores looks like a sound marketing strategy.
There is no truth in flesh, only betrayal.
There is no strenght in flesh, only weakness.
There is no constancy in flesh, only decay.
There is no certainty in flesh but death.