The cloth stakeholder now calculates its costs. These include material costs, worker costs, and advertising costs to attract users. Suppose advertising costs $2 per thousand impressions (CPM). How many impressions does the company pay for before it gets a customer? Let's assume 1,000 impressions. Thus, the cost per install (CPI, that is, the cost of attracting a customer) is $2. In order for the company to make a profit, the user must be active for at least 20 days. (20 days * 30 cents / day = $6).