URL previewing is really a problem when it comes to using such banners. It can be done, but not for Navigator 2.0x or MSIE 3.0, the two clients in the widest use today. For people who use those browsers and hate status-bar banners, he suggests his applet called Banner Killer that extinguishes the little buggers. Advertisers seem willing to risk alienating some members of their audience to lure a few more eyeballs. My unscientific survey of online advertising professionals found that few of them actually like status-bar ads or looped animations in banners.
Advertisers get the attention of their target audience, but risk alienating it.
However, I feel that most would be prepared to take this risk rather than be ignored. In other words, negative attention is better than none at all. Thus, the idea of being intrusive with online advertising is gaining credibility among Net marketers. Like the hollering car huckster, they're actually trying to bug you. This is driving advertisers to look for other ways to get their message across.