My experience on ebay has been generally very positive. This summer alone I found three different records I had been looking for in vain for years. I have found several sellers who grade accurately and who take great care in the shipping of the LP's. And yes, the best sellers do all seem to ship them in the manner you describe, for the reasons others have stated above. And no, I have never seen any of the good ones describe a record as mint, unless it was still sealed.
There are certainly people out there who have no clue or who are trying to make a fast buck, but if you know what to look for in a seller, there are some great ones out there. Most of the ones I have bought from have even cleaned them very well first. I have only had a real problem once, and the guy made up for it by sending me something else I requested for free. If you are not sure about a seller, ask them all the questions you want. The good ones will always answer, whether it's ebay or audiogon or wherever.
There are certainly people out there who have no clue or who are trying to make a fast buck, but if you know what to look for in a seller, there are some great ones out there. Most of the ones I have bought from have even cleaned them very well first. I have only had a real problem once, and the guy made up for it by sending me something else I requested for free. If you are not sure about a seller, ask them all the questions you want. The good ones will always answer, whether it's ebay or audiogon or wherever.