[colin8chSE]

"product that we know is very useful for our customers"- For some businesses this can become obvious from metrics like signups and usage- although there is a difference between a "user" and a "customer". Linkedin is a good example by glimcat.

If you want to build a BUSINESS that has a "product that we know is very useful for our customers"- To have a business you need customers, customers pay, and paying customers validate that the product is useful to them, otherwise you just don't really know.

If you would like to start charging from day one with the minimum of time and effort, if you want to get to market ASAP and gain traction fast- check out Simplified Ecommerce. I'm the Founder.

http://promo.simplifiedecommerce.com/killer-startup