Using an ATM machine outdoors can be risky. Once customers learn there is an ATM "inside" your business, this could lead to an increase of people who prefer to withdraw cash indoors.
Hosting an ATM machine in your business leads to an increase in sales. Period. Once customers have cash in hand, they're readily available to spend it on your products and/or services.
Customers want to feel safe. Therefore, providing customers a safe means to withdraw cash enhances their loyalty to your place of business.
An increase in both traffic and sales equals more cash flow for your business. And, too, the monthly ATM Machine transaction profits are an additional source of cash for your business.