The one constant with trends is they do not last. They are always based on a new technique or technology and follow an interest cycle. Since human beings by their nature move on to something different, new and perceived as better (and usually ACTUALLY better), if you are attached to any one trend, you are doomed if you don’t adjust and keep up with the times.
It’s dependent on traffic. Traffic goes up and down and you never know when it is going to do a major dip. Most advertisers pay based on the number of views their ad will get. This turns you into a traffic monster. You start to look for creative ways to get any kind of traffic, no matter if it’s good traffic or not. This can easily lead to your site becoming another junk site that you try to avoid.
As you can see there is no shortage of methods with regards to making money on your blog. While it might be tempting to try and make money right away, I would advise you to focus on getting a nice foundation built up. Offering services from day 1 can work out for you and bring in some clients, but as your blog grows you’ll find that your time is better spent making products.
One criticism: I bought the print version, and there are a few illustrations there that were obviously done in color for the e-Book version, but they wind up in black-and-white in the print version. Surely it could have been easy enough to change the way these illustrations looked in black and white to optimize it for the print book e.g. using dotted or dashed lines, or more strongly contrasting shades of gray? I felt rather frustrated at that. However, it was the only problem I encountered (it only affects literally a few small things) and it was not a major drawback. I still give the book a full 5 stars, it's still great despite this minor issue.
Make sure that you're always posting amazing content. The better your content and the more interesting your blog, the more people will link to it. There is nothing better than getting free links just because people liked what you have to say! Keep your mind on the SEO side of things, but also remember that you are ultimately catering to the needs of the people in your niche. If they like you, the search engines will like you.
Working with advertising networks isn’t your only option when it comes to selling ads. If you end up with enough traffic, advertisers may come directly to you and ask you to place their ad on your site. You can also contact advertisers yourself. The biggest difference from the above mentioned option is that there is no middle man, which means you can set your own ad rates.