I was just wondering...
If you were continually misspelling something or using incorrect punctuation, etc. etc.... would you want someone to let you know?
Or would you not care?
There's definitely two camps on this issue. Some people don't care about this and don't see where it makes a hoot of difference as long as you understand what they are saying.
Others feel spelling and punctuation are important (at least, they were taught that it was in school) and that it speaks to one's intelligence.
What do you believe?
I was taught, and believe strongly, that the way we communicate is very important. Spelling, punctuation, grammar are all standardized to help us communicate clearly - it's not so much a sign of intelligence as it is respect for the person with whom you are communicating. If you don't think enough of me to speak or write clearly, then why would you expect me to pay attention to what you are saying or writing?