That always upsets me. Some of the worst grammar I've seen is from people on craigslist. It's amazing. How can you send a business reply without a shred of professionalism?

Why would you not try to be clear and polite to someone who is going to buy from or sell to you? I understand that not everyone is lucky enough to have great education and knowledge of grammar and spelling rules. But, I feel that there's a huge difference between lack of education and negligence of clarity.

A few mistakes are okay as long as it's still understandable, but anything like the example you showed, that just represents apathy and disrespect. That's what spell check is for!! Read over it a couple times!