You don't have to be "Mr. ebay" to realize that you must employ a degree of skepticism when buying anything from anyone that you will never see, meet, or even speak to. When all you have to go on is the hope that the desired item is as described by someone that you don't and never will know, you have to be leery. But you don't have to dismiss all of them immediately as scammers either. Just do some background work. Its that simple.
And as far as "nitpicking" about the way that others may type, lets face it; when someone strings together fourteen or fifteen thoughts or ieas into one sentence using all caps and no punctutation, its difficult to follow what the person is actually talking about. Thats all.