More and more people are turning away from private guitar lessons to online guitar lessons because of expense and because of just how effective many people find online lessons to be.
The first issue is expense.
Private guitar lessons are very expensive because you must pay for each lesson individually.
As you are likely to need many, many private lessons to learn what you want to learn this means that you can spend a small fortune by going the private lessons route.
When you buy your guitar lessons online on the other hand you only pay once.
Once you've paid for your guitar lessons online you can simply download all of the lessons (written, audio, & video) and use them forever.
The second issue is effectiveness.
While it is nice to have a private guitar teacher to give you instant feedback on what you are doing right or wrong it can also be a hindrance if your guitar teacher isn't that good of a teacher (or perhaps not even that good of a guitar player!) When using online lessons you don't have to worry about that.
The third issue is style.
A lot of times a private guitar teacher will try to teach you their particular style.
But in most cases their style won't be the style that you want to play! Again, with guitar lessons online you don't have to worry about that.
You can take the information provided and use it with your own style.
This will lead to you being a more original interesting guitarist in the long run.