On the rare occasions I've done something like this I've wrestled with my conscience a bit and then salved it by making my script strip out the addresses behind any banners on the site, and then use LWP to get the data from these addresses. Obviously, although this is nice for the site owner I'm now ripping off the advertisers, who think my LWP clickthrough is something to celebrate, and I'm not sure this is any less reprehensible; but it pushes the reprehensibility a little further away. Perhaps what you really need to do is write a script that clicks through the advertisers and then randomly buys stuff from them. But that way madness lies.
§ George Sherston