I know, there's an FAQ about this, but I wanted to put my vote in for it! I know VB6 very well and making the jump to allow me to make a multithreaded app. on iOS and Android with VB.NET would be very short. My worry is that if I spent months or even a year learning C# to do the same, you may come out with VB.NET compatibility and I'll have wasted all that time for no good reason. And please no one tell me "learning a new programming language isn't a waste of time", because it would be for me! 
Your website states "Cross-Platform Apps. No Compromises.", unless you're wanting to use VB.NET. You would at least double your sales/user-base if you added VB.NET support. From reading the FAQ, it doesn't sound like it would be all that difficult. I'd buy immediately if it was available.
That's my 2 cents. Thank you for listening.