Considering I have actually done this business model in the past, I can say the biggest benefit of making money online by coaching is how rewarding it is. With coaching and consulting— the people that work with you, that pay you for your time, especially if it's a small group setting or one-on-one— are going to be passionate about what you have to say and they are going to be there for a reason. They are going to be showing up for your calls because they are paying you. They want what it is you have to give.
Often, what happens is that we run into unscrupulous Internet Marketers (IMs) who have less-than altruistic intentions of extracting money from you rather than helping you to make it. However, this isn't something new. People have been falling for networking marketing, pyramid schemes, and affiliate marketing scams since before the start of the net.
eBay is the most popular global auction site around and is a great place to sell items you no longer want. If you are looking to earn some extra cash, start out by looking around your house for things you no longer want; list them on eBay and watch as customers bid on them. You can also purchase clearance sale items and thrift store finds and make a couple dollars profit by listing them as well. The key to selling on eBay is to do your research and find out what the hot items are.