This can and should vary depending on the product or service and the goals for the company and any particular campaign. If you're selling complex, personal cons

This can and should vary depending on the product or service and the goals for the company and any particular campaign. If you're selling complex, personal consulting services, you might find your 10 responses from 1000 generic emails to ultimately lead to zero useful, qualified opportunities. But if you are testing a social, interactive service, you may find that having 10 active users on a given day much more useful than having just 1 person look at your static, deserted interface. Perhaps, in my examples above, are you trying to land a customer, or are you, in fact, trying to scale something?