101 weird ways to make money does not mean 101 reliable or useful ways to make money. Yes, while the ideas in here are certainly unusual, many of them are downright impractical and none of them are particularly well thought-out, each consisting of about 2 pages of text, with links to internet sites for you to obtain further information. If you're looking for a hobby to generate some money on the side, then maybe some of these ideas are worth looking into, but the same results could be gotten from simply Googling "business ideas with low startup costs". If you're looking to quit your day job and get rich quick with little effort, I have bad news for you.
Many of these ideas require a substantial amount of upfront investment in time, training, money, and labor, not to mention licensing and other overhead. Many are also seasonal. Some are downright dangerous or plainly stupid. Take Christmas Tree Seller. His advice? Buy a truck of cut trees... then sell them online, or rent out a lot somewhere. You could also rent live trees to people. What? If it isn't immediately obvious, 1) buying a truckload of trees and renting a lot/obtaining a street permit would require a substantial investment up front of several thousand dollars. 2) Then you'd have to deal w/ transporting the trees, retailing them, storing any unsold trees for the day, then repeating the process until all the trees are sold, or the holiday season is over. 3) doing it online would save you the cost of a retail space, but who buys trees online? Mailing a tree would negate any profit from selling it. 4) I've never heard of anyone renting a live tree. Would the cost of returning the tree be worth the hassle and expense for anyone?
Chimney sweep - dangerous, outdated. Is this 19th Century England? I don't think I need to elaborate. Rooftop snow remover: dangerous, requires investment in equipment. You also need to be licensed and insured.
Pedi-cab driver: dangerous, hard work. The going rate for a pedicab is about $3-4 a minute in NYC. That's about $240/hr before you factor in license fees, permits, equipment, insurance, etc. The fee is about $190/yr. NYC requires a minimum insurance coverage of $100,000 for personal injury and $50,000 for property damage. Do you want to be out in the hot sun and battling NYC taxi cabs? Low competition? Hardly. I work in midtown Manhattan and see pedicabs everyday. They are usually empty. Very few tourists will spend $3-5/minute for a pedicab when they can spend that same money on a guided tour bus or taxi.
He has part-time magician, but interestingly, no part-time face painter. At a recent kids' birthday party, there was a face painter. My friend said he paid her $300 for about 2 hours of work. The investment is very low in materials (probably $200 for the paints, brushes, sponges, and other materials). But you also need some degree of artistic ability (or a lot of practice following templates). Practical? Quit your day job? No. The artist at the party has a fulltime job during the week. Some of his other ideas require special talent: rodeo clown, street performer, comedian, casino dealer..
Brewing beer for fun and profit: Not practical for most people. Beer making is not as easy as it sounds and requires a substantial amount of learning, equipment, and experience. Oh, you also need a professional license to sell it. Most of the things you want to do are actually illegal. Read this book: Everything I Want To Do Is Illegal: War Stories from the Local Food Front.
Read this for laughs if you must. But this is merely a random collection of hare-brained ideas, most of which can be gotten from the internet for free. If you're any kind of savvy entrepreneur, you already know not to fall for these cheap tricks and better ways to invest your time and money, like buying and selling stocks, or even eBay. But then again, he wouldn't be able to market his book, as these ideas are not "weird".