I’ve previously written about proofreading. This is a slightly different point. It isn’t just about catching typos.

Sometimes your marketing piece creates a different effect than you had envisioned. You may not notice the branches seemingly growing out of someone’s head or the accidental obscene reference. Other people will.
So: It is always a good idea to step back and take a fresh look at something before it goes online or is sent to the printer.
Embarrassment is not fun.