There are Three Things Noticed Subconsciously on the First Impression

1.  How much effort has been put into this business?
If the design looks gorgeous and creative, then one can assume a lot of time has been put into it. We can then assume that the same level of care is put into customer service and products. Good design tells your visitors that you care about your product. Good design at the front-end suggests that everything is in order at the back-end, whether or not that is the case. Good design is what separates the best from the "good-enough".

2.  How modern is this business?
This isn't always as crucial, but it still bears mentioning. We can all recognize older designs a mile off, whilst good design is in no way limited to the most recent trend, keeping up the pace will help your image and in turn, tell your customer subconsciously you keep up with the latest technology.

3.   What is the company's personality?
To the point? Friendly? Business-like? A good design fits the image of the company behind it. Your aesthetics are all you have to paint that initial picture.

From that one glimpse, they make an impression, and then they decide if it's worth their while.