Shrink wrapped items like CDs, software, books and small consumer goods sell well. Food and scents are more difficult to sell. If you want to buy a leg of lamb you want to see it first, judge its fat content and see what you are getting. Also, food has a limited geographical market unless it is something like a hamper or tinned food. Financial services that allow the customer to compare offerings from different suppliers are perfect for Internet browsing.
Airline tickets are another example.
The customer knows exactly what he or she is buying - the only aspect to be examined is the price being charged by competing airlines or the perks of a particular flight or airline. Your target market must . . . Too much time, money and energy is wasted by site owners in targeting the whole wide world like a shotgun blast spreading pellets over a vast expanse. One pellet is all it takes if it is aimed correctly. If your are selling breast enhancements there is little point in advertising in your local football team's match programme.