You can click on someone's pTrader (number) and pull up all the ratings they have received for Swap n Shop transactions. Gives you an idea of how they operate. It's pretty much a given that if you have a transaction, you will give that person a pTrader rating with comments. You will notice that most of the people on this forum get very favorable comments all the time. This is why it is so good to buy on Swap n Shop--fellow hobbyists are proud of their plants and take pleasure in sharing them with others (and perhaps making a little profit, too, which is not a bad thing). Just keep the weather in mind when getting plants, even in the summer (107 in Texas!).
ICEH2O, same problem. You always wonder if the person was unhappy or just couldn't be bothered. In some cases, I've had the person tell me they were delighted, only to not leave feedback. I too always leave feedback. I don't get it.