Take the offer. The domain is OK, has a few purposes (money making blog, promoting a money making book, and similar), but it's not going to have a queue of buyers. You might find yourself sitting on it for a few years before you get another good offer.
Some interesting insights on IntentionalMillionaire.com - all appreciated. This domain sale is becoming more and more interesting since we turned down a four figure offer in mid-December. We'll see...