Future of promotion is media and having a website will play a vital role in the arena of the current and future world. The design can have an impact on the visitors to make decision whether they should spend time and money with you or just to browse and land somewhere else. Having a professional design and able to present in the galleries across the web will grab many audience whom never been connected without this, which in turn increase the traffic and add the client base.
When the numbers of visitors are getting increased automatically people spend time and definitely will trickle into the sales. Professional design will save time and the showcase need not been cleaned as it is done in the physical state. So you can focus on increasing the traffic which will trigger the sales and visibility of the website. Also the design can be updated easily and also it will take one or two years time gap.