Stern's release schedule is built around what their factory produces and needs to be kept busy. When sales begin to flag, the next title is rolled out.

This is exactly the same model that Spooky follows, but instead of needing to make 50 machines a day Spooky makes 2. Charlie releases new titles when his team needs something new to build (like how they finished Alice Cooper and now moved to Rick and Morty and we won't see a new Spooky game announcement until 2021).

The other thing to consider is games stay in production at Stern for at least 3 years. There's about 10 different titles you can order from them currently? There's no need to buy on day 1.