Form joint promotional partnerships with complementary sites for cross marketing and sales initiatives. Think about a different approach for example integrated sponsorship of a whole site. ROI return on investment, how much each sale costs. It make people curious and they will click it. The most effective words to include on a banner are free , save , and win .
Animated banners have a higher click through rate than static banners.
Use bright colours on your banner ads to catch the viewers eye, blue, green, and yellow work the well. Adverting in niche e-zines may be more effective, and cheaper than advertising on sites. Check that the number of subscribers they claim is accurate. Put an offer on your ads which is attractive like, get a free sample, or free information. Use the tag with your banners so that people have something to look at while it downloads.