Thanks. It was 30% off to the penny. I sent her a message with a counter offer but she ignored it. I probably shouldn't have bothered. Mine is already cheaper than most, if not all, others.
I've never used it before, but I'd assume that if a buyer submitted an offer for 50% off, Tradesy would probably have an automated messaged that said 30% or this amount this is the lowest best fair offer. I can't imagine a buyer actually submitted a perfect 30% off to the very last cent (I would submit my offer to the closest $5/$10 denomination amount). It is most likely computer automated.