A game’s launch window is one of the most important parts of its lifecycle. For most titles, this is when the majority of lifetime sales are made. It’s absolutely vital to drive as much excitement and hype as possible during this critical period of time. One reliable way to do this is by offering pre-order sales, founders packs, and other pre-release goodies. A solid pre-order campaign can even make up 20-30% of your game’s first-year sales.
Link:
https://xsolla.com/blog/breaking-into-the-new-market-pre-orders