The value of that currency will fluctuate. What seemed golden a year ago now looks worthless. That, too, will change. Finally, the key to keeping the customers you get is service. Make every customer service call an opportunity to thrill someone.
Large companies see customer service as a cost, and an opportunity to up-sell.
Don't make that mistake. All these things are basic. They work when you're building any business, online or offline. That's important to recognize as you move ahead. The differences between building online and offline businesses, and how they operate, are becoming invisible.