I'm currently in a spat with a member in my writer's group over my typos in my last submission. She says there are so many, she can't get through it. OMG She should have seen A Kiss for Emily the first time I got it back from CreateSpace as a proof. We found an additional 100 typos (usually wrong word not picked up by spell check).
What some people fail to understand, especially for those who can do it well, typing, spelling, and proof reading can be VERY FRICKIN' difficult for those who don't do it well. Perhaps if people took the time to understand reading/writing disorders, left-right dyslexia, and other related disorders, they would see the good, not focus on the bad.
Generally, as I fix one paragraph, I'll add one or two different mistakes. Typing a sentence like, The dog is very hairy, will usually come out like this for me the first time I type it, THe god si voiy hiary.
Today, I will spend at least 45 minutes typing these easy few paragraphs.