My shredder says he really enjoys eating those mailers, because they almost always have a glossy pic of a nice meal on them. He does request that I continue, without fail, to peel off the sticky stringy goo they use on the corners to hold the important invitation closed through the mail. That gives him heartburn.
For "advice", I think I'd rather go inside a McDonalds, order a big mac, and ask the counter person for advice. They might want to upsize a fry and drink, but if any ill effects should result from implementation (unlikely!), the result would be very short-lived. Unlike the "wealth" advice pedaled in the mail.