Interesting read about an equally interesting product (plugin). I can definitely see how it can help so many people.

Quick suggestion: If at any point you are looking to offer varying price points based on features, one possibility is to have three versions - Business (for people who know and work mostly on Excel every day), Developer (C#, LINQ etc.) , Complete (All features).

Because having worked with many people who work with Excel for whole day, at least 90% of the users will not understand or use this: "Additionally, imagine how much easier it would be to build prototypes and small applications if instead of VBA you could use C# (and LINQ) in Excel. You could write business logic in C#, load data from all sorts of APIs."

Not to say this will not be useful. This will be extremely useful for me (a developer). Just a thought.

Good luck with QueryStorm.