Just make sure the ingame store is functional so you can sell more add-ons to your vaporware - star citizen is the most profitable video game to ever not be released.
“Due the global economic circumstances, we were forced to make the incredibly tough decision to say good bye to one of our staff members, cutting down the work force by 100%”
This is why modding games is great. Most of the hard engine and framework stuff is already done for you, so you get to focus on content creation (the "fun" part).
Still difficult, but it requires a fraction of the time and effort that making a game from scratch would take.
Just release unfinished DLC for $35, release a "definitive version" even though that was only the first half of the DLC, release the even more unfinished second half of the DLC and still leave a bunch of shit from the base game unexplained. Yeah I'm still salty about something, how'd you know?