Wow, really? Six in a row? I've participated in hundreds of transactions through eBay (over the years) and I can only think of three that I was ever dissatisfied didn't meet the description, or that the description didn't reveal things I considered important (and bad). Two of them were transactions under $10, including shipping.
Can I ask what sort of things you were buying, and what sort of costs were involved (one, you said was $30)?
The first item was for a vintage cocktail shaker. It was listed in mint condition. I bought it for a friend's birthday. I received the shaker: it had no lid to the pour spout. The email exchange went something like this: "I received the shaker, the cap to the pour spout is missing...did you forget to pack it?"..."Cap? It didn't have a cap, I sent everything."..."How can you use this as a shaker if it has no cap?"..."Oh sorry, I know nothing about cocktail shakers, I didn't think to put in my listing that the cap was missing."..."You claim to have been selling antiques for 20 years, how could you not know this? ok, I'd like to return it"..."hmmm...its been past 7 days now, I don't accept returns past 7 days"... This was also a top rated seller with "super duper best seller" comments.