Hi OP, don't worry about your setup. Although it is a big plus, you don't really need an i7 laptop to do internet marketing, especially if you are just managing websites. What I can recommend that you buy is a laptop stand, so you can elevate your laptop screen on the eye level. This will prevent bad posture and neck pain. It will also allow air to pass underneath your laptop. Since you're already using an external keyboard, this will be perfect for your setup.
Remember, this is our work. If you work 8 hours per day in that laptop, means you have to look down for 8 hours. In a few years you might develop a problem with your neck and spine which will be the cause of multitude of problems in your body