If you're paying $1 to get someone to sign up for a game which has freemium monetization where 2% of signups pay $1 and 0.1% of signups pay $100, then it is uns

If you're paying $1 to get someone to sign up for a game which has freemium monetization where 2% of signups pay $1 and 0.1% of signups pay $100, then it is unsustainably high. If you're paying $1 to get the email address of an end-user or decisionmaker for B2B SaaS sold on the traditional $50 to $500 a month price points, and you don't totally screw the pooch on converting them, you're doing very well. If you're paying $1 to get leads for enterprise software, Oracle et al want to buy you just to take those leads, because they're used to paying $10+ per click.