That seems like an unreasonably optimistic viewpoint, based on the history of advertising, and indeed, mass market product of anything.

Optimistically: determine exactly what products they are looking for but aren't yet aware of,

Realistically: determine what high-margin products you could possible convince them of, and show those products in as intrusive a manner possible

The Internet seems to have made us all aware that the depths of human dishonesty and unethicality have no bottom.