I can't imagine prejudicing the title against those who spell correctly is a good thing. I also have to believe that statistically, more people will spell a word correctly (or at least realize their mistake) than use any particular misspelling.
The belief you mention in your second sentence there is exactly the reason that the concern mentioned in your first sentence doesn't apply. People who spell correctly aren't losing anything by leaving titles as-is.
"My two cents aren't worth a dime.";