Hi, Harley. Yes, I think most people would, but there are drawbacks associated with that like having to take time and effort away from other aspects of the game. I think The Division is the most recent example of "too big, not enough content in there". That said it's easier to get down the core mechanics and content and expand with planets, stations, and universe content later so that's just groundwork that needed to be done anyway.
A discount is something I considered early on, but ultimately I have no system in place to verify who actually owns Steam Marines 1, particularly since Desura is essentially belly-up at this point; most non-Steam buyers don't even activate their Steam keys. Potentially I could do platform-specific discounts (Steam on Steam, Itch on Itch, et cetera) but that has its own issues.