cue "old man yells at cloud" meme. Your vapid argument about income and the age/employment status of gamers aside, pre-ordering does hurt games because it encourages developers to cut content from base games to repackage as DLC. This is especially true with digital copies of games that can be harder to return. Go watch totalbiscuit's video on pre-ordering and some of the related ones, might just change your mind.
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https://www.youtube.com/watch?v=mf5Uj4XIT1Y It's a good vid