For starters, sending promotional mail through LinkedIn to a mass audience pretty much labels a person as a spammer, but in this case, it gets worse.
The person who mailed me today sent a message that began: “This could be the perfect business opportunity that fits what ever else your doing!”
If the person doesn’t know basic grammar and / or doesn’t take time to proofread and see the error in his very first sentence, WHY would I trust him to tell me anything else?