Most of the basic concepts talked about in this book are dead on accurate. Most people who make money on the internet have multiple streams. That is, they do several things that generate income and pay more attention to the ones that pay them more money. ==He's also right in listing the various ways that you can make money on the net. These simply put come down to: selling a product, selling a service, selling advertising on your site.
But it's not quite as easy as he makes it appear.
First the internet is a communications medium, that's all. It is largely the replacement for direct mail - but if you've noticed, you are probably still getting a lot of advertising mail. That alone says that the internet hasn't replaced everything.
Second, means that you've got to find a product where there is enough interest to attract a lot of attention, but not so much that there is a lot of competition. You could sell a newsletter or some other kind of electronic publication. But where do you get the material.
Third the real key is getting a lot of people to come to your web site. And that means a minimum of say 10,000, and 100,000 is better. What do you think you can do that will attract that much attention.
Fourth, he is right in that e-mail is essentially free. But advertising e-mail is usually called SPAM. And people don't like SPAM. There are laws about sending it, and while he is careful to say that you should make up a list of subscribers (called Opt-In), what can you do that is unique enough to get 10,000 subscribers.
Fifth, you are realy going into the mail order business. It's a business like any other. You have laws that apply, the IRS wants to be your partner, and so on.
Conclusion, yes, it can be done, the general rules he lists are pretty good, but it's still starting a business and a heck of a lot of work. After all, if it was that easy, Mr. Allen wouldn't have to do all the work involved in writing a book about it.