Quoted from fooflighter:
The difference is it's a game atmospheric feature that was hidden and built in from the start... And a feature that should have been standard... It's not just a light like the pin stadiums, this is code interactive and specific to the Stranger Things' world unlike any other theme.. It's not about the money, it's about the tactic, principles, and the sales shenanigans. It should have been in the features matrix.
Stern Team meeting one morning
Brian Eddy: "Upside down mode should have a great effect, as in the show it was a completely different world. So I came up with this idea of doing UV effects, shouldn't add more than $30 worth of additional parts. It's needed"
Stern CFO: "Can the game function without this feature?"
Brian Eddy: "Well, technically yes.. but"
Stern Executive: "There we have it. Sounds like a great feature that can be purchased later"
Brian Eddy: "But Upside down mode will literally suck and not have any visible differences without it"
Stern CFO: "Brian. It is a great feature and when people see it, they will pay us $300 after shipping once they realize it should have been there from the get go"
Brian Eddy: "Alright then, I have another idea..."
Stern Executive: "Mr. Eddy, the total bill of materials has already exceeded $850. We no longer have financial ability to implement anything else unless it's after sale"
Matt Damon: "Matt Damon"