When you solve a problem for your readers you will receive praise and reward. Its true, if you solve a problem for one of your readers in a post chances are more out there have the same problem. This will increase your number of subscribers, the number of comments and will most likely increase your search engine rank.
The number of reactions I get from a post in which I go into detail about fixing something or solving a common problem with a blog is usually several times more than if I just post about something or talk about something random.
So if your looking to increase the reader activity on your blog then come up with something that needs solved or create some how to guides.
Going deep when writing guides is something very important as the depth of an article really will make the difference.
Anyway, I am quite disappointed when some bloggers just don’t want to offer help to their readers because of various reasons.