[PornoDoggy]

In theory, marketing materials aimed at whales makes sense.

Methinks in practice, however, that the best way to recruit whales is to ensure "there is a phone number contact and a physical address that looks like a real office", and include "contact us for high-volume arrangements" [or words to that effect] in your materials.

I'm assuming they are not likely to simply click a join form and start sending traffic - although I'd be interested in knowing if I'm wrong about that.

Since there is no guarantee that only whales will see the "whale banners", I don't know that this is a realistic idea. There are plenty of heavy hitters around here, but there are also plenty of legends in their own minds, and I just don't think you can target whales on an open BBS.