Your return on investment (ROI) should be directly related to your expectations and your spend
What is a good return on investment for your internet marketing? Well depending on the type of personality you have, it may be any return (cynic) or untold wealth, fame and fulfillment (overly optimistic), but the reality sits somewhere between these two.
Of course it does I hear you saying, but lets face it, it is obvious.
The return on investment for your internet marketing can be a good indicator of the amount of work (and money) you need to put in to improve your campaign. Let's say you have set aside $100 a month to target Australian women looking to buy shoes, we can pretty much gaurantee that your ROI will be zero (0)
On the other hand you may set aside $10,000 a month for Internet Marketing and get some great results that generate $10,000 worth of sales a month and your campaign is a success. Sure you haven't made a profit, but you have generated interest in your products that will carry on long after you have finished this Internet Marketing campaign.
Of course there are products and niches that produce great returns on investment... until they are duplicated.
So what is the answer... common sense. There is no real measuring stick like you should be looking at $3 for every dollar you spend.