What do you consider a good ROI?
At what point is it not longer good for you?
In looking at my figures I do not take into consideration the time I spend at my PC. This is strickly my Adwords cost versus commissions.
I would like to hear from others how you are doing.
Thanks
Many eCommerce companies like to spend 15-25% of profits on marketing, therefore, ROI goals are usually 400-600%.
Affiliates like to make a profit, and many large affiliates (amazon/ebay ones come to mind) run ROIs of 120-150% and are very happy with those numbers.
Others are willing to take an initial loss on AdWords as their average visitor either buys multiple times a year, or buys a subscription (such as webhosting) - so the initial ROI looks very negative - but the lifetime visitor value is quite positive.
It's very hard to discuss ROI without getting into what you're measuring and the marketing goals of the company.