Your total investment per month is just $250
This low monthly cost is paid by direct debit and covers a list of up to 500 people. When your list grows above that figure and so is even more profitable for you, your monthly cost will increase by $50 for every 500 people on your list. So, ongoing costs for a list of 501 to 1000 people will be $300, 1001 to 1500 will be $350 etc. This is because of the incremental increase in email list software costs but it means that your costs only rise when you already have the list and the increase in profits to make it more than worthwhile.