I did because a lot of our clients and partners were non technical people using complex excel spreadsheets with macros and vba.

And since Excel is the de facto standard, shouldn't Libre Office offer a 100% compatibility to whatever Excel has if it wants a piece of that market share? Also $150/year for something that does it all and just works it's really not much. The same reason why we don't ask how much Visual Studio Enterprise costs or IntelliJ products even if you have free alternatives.