First of all I respect your right to criticize me for doing only minor proofing of a story. Actually only one reading and the old saying is that: if you make a mistake when you write it, you will probably make it again when you proof read it.
I hope to hell the stories I write here are never considered classics. I write them purely as escapism and hope the readers read them for that reason. If the typos and spelling mistakes really bother you, please feel free to move on to a more talented writer. My final thought The story is the thing.
So I write fast and dirty because I'm not trying to write classics so read them with that fact in mind. A fast and dirty storey is not going to wind up on any best seller list. However it may change what is required to be considered a fun story.