Make the Sale Today

I had an Accounting teacher Dr. Cynthia Bolt at The Citadel that used to say that “I’d rather have the money today because you don’t know what tomorrow is going to hold.” Laws change, inflation, cashflow, opportunity costs, etc. Her statement was mostly about investing and accounting, however I think this line of thinking is also very applicable to sales.  If you have a customer today, you want to sell to them today and get their money now, because you never know what will change.  This person might not be a customer past next week for any number of reason including: death, they fall of the wagon, they loose interest, and life changes.

Marginal Cost
In economics and finance, marginal cost is the change in total cost that arises when the quantity produced changes by one unit. That is, it is the cost of producing one more unit of a good. [from wikipedia] When you sell software and ebooks that marginal is practically zero.