personally, I would like to know the age of these people filing the complaints, as kokanee said, sometimes the seller is just unavailable for a day or two and buyers freak out because transaction and communication was not instantaneous.
A lot of young people are very demanding and require you to hold their insecure little hands through an entire transaction every minute of the way.
I'm not saying all people are like this, but I notice this in other hobby communities too where young people are buying into. The new wave of people want it now, not a couple weeks from now.
Hell I can't even get standard shipping anymore to save money, everyone ships express which is like 3x the cost.