The main thing people worry about (most people anyway) when they buy an engine, is the coding language. One issue I have had even with the most popular engines is the fact that I am proficient in C++ and C# yet 10/10 times I am picking between the two. Imagine if an engine had support for more languages? Theyd be the easy pick. I cant count how many times I have been coding in UE4 and said FK I wish they accepted C#, or Unity and C++.
I am unsure exactly HOW difficult it would be, but adding C# support would probably give you guys more traction as the more languages you are compatible with, the more people will choose your engine over others. Just a thought to run by you guys in this day and age of free programs.