When it comes to a design, be it a print design, a poster, an advertisement, a corporate booklet, a website, a web page, a corporate video, a 3D animation or any other kind of media, the rule usually applies. It is tempting to say “Hey I paid for this full page ad, so I had better add 10 paragraphs of text to it”, yet this will not help at all. Using larger advertisements attracts more attention to the ad. Make it beautiful and interesting. Information is not the key. Creating interest in the product IS! You cannot force a potential client to read the text on your advertisement, no matter how little or how much of it is on the page. You can however make the potential client want to read it. How? Make it look appealing and/or interesting!