And little point in getting the spelling right, if the inappropriate or absence of punctuation conveys an entirely erroneous meaning.
Unless, of course, you believe the following to be synonymous:
The defendant, said the Judge, is quite mad. The defendant said the Judge is quite mad.
Taken to an extreme, whilst most would appreciate that the phrase "Nude Reader's Wives" really refers to the nude wives of many readers, the literal interpretation would be of a lone reader sharing a polygamous marriage with several naked women (lucky sod).
But that does not excuse proper use of the apostrophe in many cases. The rule for using its and it's is simple enough, and its use in contractions and possessives shouldn't be beyond anyone who can be bothered to re-read that which they have just written.
And as a counterpoint to your emphasis on correct spelling, I would like to draw your attention to the increasing usage of txt spk, which many find reasonably comprehensible, yet which cannot, by any stretch of the imagination, be considered correct spelling.
Having said all that, I've now almost certainly guaranteed at least two spelling or punctuation errors in the above text.
Cheers Clive