When you first start out in business (and even if you have been at it for a fairly long amount of time), it can be extremely easy to confuse what is right (or even what is convenient) for you with what is the best thing for your customers. While it has become something of a business cliche that the needs of the customer should inevitably trump every other concern, far too many people who strike out on their own take the notion of working for themselves to an uncomfortable (and generally somewhat tragic) extreme, wherein they assume that the work that they do is only going to need to benefit themselves. If this is how you have been thinking, you need to cut it out immediately, before it does any further damage to your business or your personal reputation.
For far too many people who get involved with customer service (and really, what business is not heavily into customer service?), they tend to forget that their customers are human beings who deserve care and respect. If you treat your customers the way you would treat a family member who can not help themselves, and whom you really cared about, you should do a whole lot better than simply pretending to be electricity or water (by taking the path of least resistance). One of the really big problems that a lot of small business owners still struggle with is the constant need to put the customers’ needs ahead of their own needs.
When your needs involve, say, having an inventory of something that is inexpensive to you but that you then make an effort to “sell” to your customers (as opposed to simply ordering what they really need right off the bat), you have fallen victim to the classic mistake of putting your own needs ahead of your customers. You have got to remember that the most successful (and the longest lasting) businesses do not do things like that. The most successful businesses give their customers what they need, instead of inflicting their own needs on their customers. Always remember this.