One day. One day I hope Xamarin will find a different financing model, or like you said include VS support in their indie plan. It's just far too expensive right now.
https://news.ycombinator.com/item?id=7810310 => nat@xamarin.com.
Edit: the trial is mentioned in the extended FAQ http://xamarin.com/faq#pricing
One thing I didn't realize was that it any app built with the trial version can only be used for a 24 period. My plan was to build a LOB app, get my company to see the value in it and then have them purchase the full license. The 24 hour window makes that really difficult.