What's the point of having a professionally taken head-shot when you have a perfectly good camera you can use to take a perfectly good shot of yourself?
Well, quite simply, it'll look homemade. It'll look unprofessional, and it'll make you look cheap.
It won't capture you in the best light, at the best angle, and it certainly won't capture that perfect expression which exudes your personality.
These are the things that you should pay a professional photographer to do for you, because they are skilled at how do all of those things!
You see, you don't just pay a photographer for their ability to use expensive equipment which creates quality images. You pay a photographer for their expertise in the way they position you, the things they can say to you in conversation to evoke those warm, spontaneous expressions which make you look approachable, friendly, yet professional.
A good professional photographer is worth their weight in gold, and even if you're not in business, if you're on the job market, it can make a massive difference to whether people pick up the phone to talk to you, or send you that email that could mean a very lucrative opportunity for you.
You don't get second chances to make a first impression, so make sure you show yourself in your best possible light, especially when you are likely to often be "meeting" people for the first time online these days. A professionally taken head-shot is vital!
Moral of the story.... don't look cheap, and nobody appreciates a morgue like photo. You always hear "invest in yourself";
A great head-shot takes you there.