I'd sooner trust a seller with a 98.5% rating and 1,000 transactions than someone with a 100 and fewer than ten transactions. It's a bit of a judgement call. I always check the negative and neutral detailed feedback to see what those say, because some buyers will give 5 star but leave negative detail, and others are ridiculous and rate low just to try to get a refund. If its an expensive purchase or I feel nervous, I google the heck out of them, as well.