Free watermarked test renders

I was wondering if it'd be possible at some point for Chaos to introduce free watermarked test renders (say 1-5 frames of an animation) so that we can get an idea of how many credits that we might need to buy for a project without having to spend a minimum of £90 for 100 credits. Either that or some kind of a calculator or estimator built into V-Ray for Maya that'll give us a rough estimate of how many credits we might need to buy in order to render a still or an animation using your set-up.