Whatever the case, I think you'd do better by charging say $30 for it. The base game + 6 expansions worth of content + all the engine upgrades and improvements + new art + new music + ability to mod the game is easily worth $30 in my opinion.
Then giving people who own the original game on Steam a 33% discount, effectively making it $20. That way nobody could complain that the original supporters are getting shafted, and you might end up making more money in the end.
One other idea is that, given that modding will be integrated into the new game, you could have community members work alongside you making mods during the development process, and then release those (with their consent of course), as part of the base game that could be turned on and off with the click of a button just like any other option within the game. The mods themselves would become the extra content that became the game's selling point, leaving you guys to just focus on all the core issues and improvements.
That's just an idea of course. I've already thought of a mod for example that removes hull types altogether, and rebalances the entire game based purely on mechanics such as hp, armor, firing range, damage, etc., creating a more dynamic and intuitive balance that doesn't require players to know endless hull type interactions which can initially be confusing and causes a lot of problems. This could absolutely be marketed as an alternative to the main game.
Of course that's just a thought, just trying to help.
