Please note that I have changed the heading of this thread slightly to reflect that the direction of the discussion has turned towards how a free trial on the MP could look like. As the true underlying objective should be to improve quality of items in the MP, highlighting good developers and generally improving the reliability of the MP, discussing the Free Trials route would seem to be a win for all and the way to go, judging by many posts.
So the thread is now called:
How should a Market Place refund or free trial policy look like?
It would seem that we need to push this so please add your vote to an already existing topic rather than vote here so we maximise effort: