There are many variables that determine how successful you are with your Web site or affiliate program. Many sites exist simply to put up 5 or 10 banners per page trying to make a quick buck.
Visitors leave the site before the page loads.
A good site focuses on serving its readers needs. Let readers provide you with feedback. This way, our readers help us improve our site all the time. Design is important - that means if you can get your information across without 20k fancy graphics, don't worry about the graphics. You might only get 3 or 4 mouse clicks to deliver what your reader wants.